Secret codes（密码）keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.

    People have used secret codes for thousands of years. {#blank#}1{#/blank#} Code breaking never lags（落后）far behind code making. The science of creating and reading coded messages is called cryptography.

    There are three main types of cryptography. {#blank#}2{#/blank#} For example, the first letters of “My elephant eats too many eels” spell out the hidden message “Meet me.”

    {#blank#}3{#/blank#} You might represent each letter with a number, for example. Let's number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message “Meet me” would read “135520135.”

    A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. {#blank#}4{#/blank#} For example, “bridge” might stand for “meet” and “out” might stand for “me.” The message “Bridge out” would actually mean “Meet me.” {#blank#}5{#/blank#} However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

A. It is very hard to break a code without the code book.

B. In any language, some letters are used more than others.

C. Only people who know the keyword can read the message.

D. As long as there have been codes, people have tried to break them.

E. You can hide a message by having the first letters of each word spell it out.

F. With a code book, you might write down words that would stand for other words.

G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

    Have you used “um…” “like…” “you know…” in your speech? Catch words(口头禅) are unnecessary words used to fill up dead paces while you speak. Speaking too many catch words is like a bad habit that we are unaware of. While most people tend to ignore it in everyday conversation, in a formal speech or an interview, too many catch words can make even the best presentation look bad.{#blank#}1{#/blank#}

    Stop when we are in doubt. Catch words are used more often when a person is unsure about the sentence to use next.{#blank#}2{#/blank#}If you are lost or in doubt over what to say next, just stop speaking, take a long pause, breathe in , figure out what to say and start again.

    Speak consciously and slowly. If the speech is too long and you talk continuously without thinking, then you might also be pushing in a few catch words in between.

    {#blank#}3{#/blank#}It is best to memorize the tricky parts of the speech, like the introduction and the conclusion where a majority of the catch words are used.

{#blank#}4{#/blank#} Preparing for the speech is very important when trying to remove catch words. Make it a point to pause when there is a comma or give two pauses at the end of the sentence. If certain words in the speech need to be emphasized then underline them and practice them as they need to be said.

    Avoid catch words in conversations. Get a friend or your partner to help you out when rehearsing a conversation.{#blank#}5{#/blank#} Although it can be an unpleasant and often embarrassing process, but in the long run it helps in cutting down on catch words.

A. Practise your speech when you can.

B. Remember the saying that silence is golden.

C. Therefore we can find out best friends to guide us well.

D. Anytime you use a catch word, the friend can point it out.

E. So we should learn some ways to avoid speaking such words.

F. Structure the speech well to include as much information as is needed.

G. The mind is so busy trying to figure out what to say that there is a strong urge to speak such words.

    How do actors and actresses memorize hundreds of lines? Memorizing lines takes practice and constant repetition. However, there are a few ways to make the memorization process run smoothly and quickly.

    {#blank#}1{#/blank#}

    For most performers, there is no quicker way of memorizing lines. To learn lines, an actor must recite the play loud over and over again. Most rehearsals (彩排) encourage this by running through the lines or having a “read through”. By the time opening night arrives, most actors have spoken their lines hundreds of times.

    Listen to your cast members.

    Sometimes inexperienced actors spend rehearsals just looking at fellow performers, waiting patiently to say their next line. {#blank#}2{#/blank#} This will help the actor learn his lines better because the context of the dialogue is absorbed.

    {#blank#}3{#/blank#}

    Because there is often not enough rehearsal time, many performers find ways to listen to the play's dialogue during everyday activities. They use a tape recorder or an MP4 player to listen to the lines from each relevant scene (剧情). Some actors prefer to record the lines of all the characters, including their own. {#blank#}4{#/blank#}Others like recording the lines of fellow cast members (参演人员), and they leave a blank space so that they can insert their dialogue while listening to the recording.

    Think positively and don't panic.

    Most actors will experience stage fright before the opening night. Actors forget lines now and then. When it happens, however, most of the time the audience never notice. If you forget a line in the middle of your performance, don't freeze. Stay in character. Keep the scene going to the best of your ability. If unfortunately you forget a line once, you will probably never forget that line ever again. {#blank#}5{#/blank#}

A. Record your lines.

B. Practice makes perfect.

C. Read lines loud and repeat them.

D. Read lines loud and remember them in a flash.

E. Sometimes embarrassment is the toughest method of memorization.

F. Then, they not only listen carefully, but they also speak all of the lines.

G. Instead, they should be listening carefully, responding in character at all times.

    Does a Dog Help a Teen with Low Self-esteem?

    A dog is known as man's best friend for good reason. Loyal and affectionate, a dog companion can enrich its owner's life in many ways. {#blank#}1{#/blank#} Many teenagers suffer from periods of low self-esteem(自尊)as they try to navigate the wavy waters of adolescence and deal with all of its associated highs and lows.

    A teenager who lacks self-esteem may feel isolated from his peers and unable to tell his parents about personal issues. The company of a dog can be a huge comfort and ease feelings of loneliness and awkwardness. A dog offers genuine unconditional love. {#blank#}2{#/blank#} 

    All dogs need exercise, so taking his dog for a walk is the perfect opportunity for a teenager to get outdoors and benefit from fresh air and physical activity. Exercise allows people to take control of their bodies, which is often the first step toward regaining control of other aspects of their life, says mental health specialist Dr. Alan Cohen. {#blank#}3{#/blank#} Exercise releases chemicals called endorphins (内腓肽) into the brain, which create positive responses in the body, including improved self-esteem.

    Dogs can help teenagers be more sociable and make new friends, suggests HELPGUIDE. {#blank#}4{#/blank#} A dog is a great ice-breaker, avoiding awkward social situations and putting the teenager at ease with people he meets. The more confident the teen becomes when out and about with his dog, the more his self-esteem will improve.

    {#blank#}5{#/blank#} If a teenager is suffering from depression or developing dangerous habits such as alcohol and drug abuse, more extreme action may be required. In these cases, professional help should be sought. Parents who suspect that their teen's low self-esteem is a sign of a far more serious problem should ask a suitably qualified health professional for advice.

A. It simply accepts its owner for who he is and doesn't judge, question or criticize.

B. In some cases, having a dog will not help with a teenager's low self-esteem.

C. Pets offer an unconditional love that can be very helpful to people with depression.

D. You don't have to worry about hurting your pet's feelings or getting advice you don't want.

E. In particular, someone with low self-esteem may find a pet dog to be extremely beneficial.

F. Many forms of exercise besides walking can be enjoyed with a dog, such as cycling, jogging and throwing a ball.

G. A teen may meet his peers while walking his dog in the park or taking part in a dog training class.

    Recently, crazy rich Asians are posting photos of themselves facing down and surrounded by luxury goods in a new trend sweeping social media.

    Falling down in public is embarrassing for most people. However, the new social media craze(时尚)called the "Falling Stars Challenge" has turned falling into something fun to do.

    The craze began in Russia. {#blank#}1{#/blank#} Items like handbags, accessories (配饰) and cash were spread out on the ground around them in the photos. People shared these photos to show off their wealth.

    The craze soon became popular around the world. {#blank#}2{#/blank#} People are using it to show off their hobbies and professional talent. The items in their pictures show what they do for a living and what they have achieved in their lives.

    {#blank#}3{#/blank#} For example, students fall down on textbooks and test papers. Police officers fall in front of their police cars with handcuffs (手铐) in their hands. Famous people are also taking the challenge. Writer Liu Tong took a fall with dozens of copies of his new book.

    More than 1.08 million Chinese have taken this challenge on Sina Weibo. Their pictures have been viewed more than 2.22 billion times. Internet users also comment on these posts. {#blank#}4{#/blank#} One Weibo user wrote: "This shows the positive energy of fighting and working hard. Applause for these young people!"

    However, some also think the craze is just another example of a successful internet meme (网络爆红). {#blank#}5{#/blank#} What do you think? Will you try this challenge?

A. They think people are just imitating others.

B. Most of them speak highly of the craze.

C. However, in China, it is taking on a new meaning.

D. The challenge is particularly popular among young people.

E. The biggest reason for the success of the challenge is simple.

F. People from all walks of life are taking part in it.

G. People posted pictures of themselves faking a fall.

    If you're thinking about studying abroad, but aren't sure how to convince your parents or yourself, here are some of the best reasons why spending a semester or year overseas is a smart and fun thing to do.

    {#blank#}1{#/blank#} Want to impress potential employers? Companies around the world continue to invest in the global market, and prefer to hire employees who have international experience. Not to mention the knowledge of a second language. Your resume (简历) will stand out from everyone else applying for the same position.

    Learn foreign languages. Language teachers say being immersed (沉浸) in a culture that speaks the language you want to learn is the quickest and most effective way to learn it. {#blank#}2{#/blank#} As globalization brings the world together, it's important to be competent in more than one language.

    Experience different cultures. Immersing yourself in a totally different culture is powerful. You'll experience things like trying different foods, celebrating traditional customs, and learning the history of another country. A person's culture reflects beliefs and values that influence their way of life. {#blank#}3{#/blank#}

    Expand your worldview. Previously held beliefs about foreign countries will change once you've been abroad. {#blank#}4{#/blank#} It can be surprising just how much you know is slightly biased (有偏见的), based on where you're from. It's also a unique opportunity to educate others on your country！

    Earn money! {#blank#}5{#/blank#} We are pretty lucky that English is the international language of business. It's an important language that many foreigners want to learn. You can get paid for teaching, interpreting, or translating English while you're studying abroad.

A. Discover what you want out of life.

B. Improve employment opportunities.

C. You can actually earn income while you study abroad.

D. You'll gain a completely new view on your own country  too.

E. You'll gain an understanding of this that can't be taught with books.

F. Mastering a foreign language opens up all kinds of new opportunities.

G. You'll miss your friends who will want to share their culture and ideas with you.