根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

      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 threemain 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 “13 5 20 13 5.”

     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.

    Hobbies let you explore interests outside your work. {#blank#}1{#/blank#} There are plenty of options available to you. How can you choose the hobby that suits you from these options? Here are some tips.

    Look at what interests you. And examine what takes up your spare time, when you have it. Do you enjoy reading books? Maybe you want to try your hand at writing them. Do you like a cool beer at the end of the day? Maybe your hobby could be trying to make beer at home. {#blank#}2{#/blank#}

    Think about what you value most. What qualities do you think important? Do you value wisdom or courage? Do you admire artistic expression? {#blank#}3{#/blank#} For instance, maybe you could volunteer at a library as a hobby because you value education, or maybe you could take up painting because you admire people who can express themselves with art.

    {#blank#}4{#/blank#} Certain hobbies require certain skill sets. If you don't have much patience, then maybe hand sewing isn't something you'd enjoy. However, if you love building things, maybe you should consider a hobby like building furniture.

    {#blank#}5{#/blank#}Ask your friends and family what you seem to talk about the most. Now, think about what it is about that subject that you enjoy so much and determine how it can be turned into a hobby.

A. Help others to choose a hobby.

B. Examine your skills and personality.

C. Turn what you already love into a hobby.

D. Decide whether you're interested in one thing.

E. Think about the topics you go on endlessly about.

F. They let you be creative and try all kinds of new things.

G. Let those qualities guide you when you're choosing a hobby.

    Are you afraid of making mistakes? Learn to accept mistakes as opportunities, and then you'll feel less stressed and fearful and you'll be more confident. {#blank#}1{#/blank#}. So what should you do?

Be open to making mistakes

    {#blank#}2{#/blank#}. Be open to making mistakes and consider them as opportunities to learn valuable life lessons. If you are open to leaning from your mistakes, you will be able to move on rather than wallowing in (沉湎于) regret.

Be aware

    {#blank#}3{#/blank#}. Be aware of what you are doing, why you are doing it, how you feel, and how you make others feel. Sometimes, your words are not understood exactly or you say something but it is not what you meant to say. {#blank#}4{#/blank#}. By being fully aware of how you impact (影响) others, you maintain an open state of learning which allows you to constantly practice being a better person.

    {#blank#}5{#/blank#}.

    Whenever you make a mistake or you are involved in a misunderstanding, take responsibility. There is always something to be learned or improved even if the other person is wrong, too.

A. Behave yourself

B. In short, you will benefit from the mistake.

C. Accept full responsibility

D. In other words, look for areas of improvement.

E. People have difficulty expressing what they really mean.

F. Accept that you're human and that each of us will make mistakes

G. Repeat your words so that others can learn from your mistakes.

How to Have a Successful Teenage Life

    Everyone dreams of success in their life, don't they? Even as a teenager, you can achieve success in your life; it really isn't that hard. {#blank#}1{#/blank#}

    Do well in school.

    No matter how boring it is now, education will help you be a productive member in society. Try your best for excellence in school; listen to the teachers, do your homework, study, and get good grades. Doing so will help you get into a better university, which will enable you to have a bright future. {#blank#}2{#/blank#}

    Do good in your community(社区).

    Volunteering can not only improve your community's status, but it could make you happier. Studies show that people who volunteer are less likely to develop depression (抑郁)than people who don't. {#blank#}3{#/blank#} For example, if you love animals, volunteer at an animal shelter. If you love helping the environment, plant trees or pick up litter. When you help others, it will make you feel better about yourself.

    {#blank#}4{#/blank#}

    Remember, they're there to help you be the best that you can be. Respect them and value their opinions, even if they annoy you sometimes. {#blank#}5{#/blank#} You don't get to choose your teachers or your family, but you still have to put up with them. Learn how to deal with people now, because when you're an adult, you don't get to choose your boss or your co-workers, so learn how to respect them now.

    These points can help you enjoy success in your teenage life.

A. Live life to the fullest.

B. School sets you up on the right track!

C. Be nice to your parents and teachers.

D. Find chances to do volunteer work that interests you.

E. It will help you pass time and develop your personality.

F. Here are some important points that you may find helpful.

G. Keep it in mind that they do the things they do because they care about you.

    Pay more, and you get unexpected results.

    •Give what you can.

    You clean out your closets, right? Perfect. You don't need a half a million dollar check written out to your charity of choice to help someone. Maybe you have a few shirts you don't wear anymore or a few children's books you can bear to part with. The thing about giving a little is that when everyone gives a little, suddenly it turns into a lot. {#blank#}1{#/blank#}.

    •{#blank#}2{#/blank#}

    In a world where smart phones rule and it's not just possible, but normal, to have entire conversations without ever looking someone in the eye, it can be exciting and wonderful to lock eyes with someone grinning. Happiness is contagious, and it only takes a couple facial muscles to spread it.

    •Use please and thank you.

    Not to sound like your grandmother (go ahead and sit still!), but the smallest ways to show your thanks are these little words. They take zero effort to say, but the impact is huge. Aren't you thankful someone held the door for you when your hands were full? {#blank#}3{#/blank#}!

    •{#blank#}4{#/blank#}

    This is the best kind of multitasking! Whenever you get a little, give a little. There's a couple ways to finish: You can do it yourself (donating an older shirt when you pay for a new shirt, etc), or support companies that are passionate, good-hearted (really fun) do-gooders. Doesn't it get much better than that, does it?

    •Get in touch. Then listen.

    Maybe a grandparent is eating at the bit to hear about your adventures, or maybe an old friend had a really bad day, maybe your mom wishes you，d ring her up more often. {#blank#}5{#/blank#}. You're member that your iPhone can make calls, right? Get in touch with those people that are dying to hear from you (because someone indeed is). Then, ask: How are you doing? What's new? These questions have such few syllables, but their depth is endless.

A. Tell them

B. Get on the line

C. Give when you get

D. Be a part of that lot

E. Support someone else

F. Smile with eye contact

G. Start building your wings

Quick tips for better time management

    Are you a good time manager? If your answer is "no", here are some tips on how to be a better time manager:

    ⒈Create a daily plan. Plan your day before it starts. The plan gives you a good description of how the day will go on. That way, you will be ready to deal with most of the things you meet. {#blank#}1{#/blank#}

    ⒉Focus. Are you multi-tasking so much that you're just not getting anything done? {#blank#}2{#/blank#} Only focus on what you're doing. You'll be more efficient(效率高的) that way.

    ⒊Stay away from your time wasters. What takes your time away from your work? QQ? Email checking? {#blank#}3{#/blank#} One thing you can do is make it hard to check them — remove them from your browser(浏览器) quick links.

    ⒋{#blank#}4{#/blank#} Don't take on more than you can deal with. For the distractions(分心的事物) that come in when you're doing other things, give a firm no. Or do it later.

    ⒌Decide to be early. When you prepare to be on time, you'll either be on time or late. {#blank#}5{#/blank#} However, if you decide to be early, you'll most likely to be on time. For appointments, try to be early. For your deadlines, meet them earlier than required.

A. Learn to say "No".

B. Cut off when you need to.

C. Stop checking them so often.

D. Most of the time you'll be late.

E. Great ways to know your time spent.

F. If so, focus on just one key task at one time.

G. Your job for the day is to follow the plan as best as possible.