Sleep is something we all do. But some people need to sleep more than others. Babies sleep most of the time. Children in school sleep about ten to twelve hours a night. Most adults sleep only seven or eight hours.{#blank#}1{#/blank#}All parts of our bodies have to rest after they work.. Our arms need a rest after we lift heavy thing, When we run fast, our legs work hard. They get tired. We have to rest them. Our brains workhard, too.{#blank#}2{#/blank#} We can sit quite still and rest our arms andlegs. But our brains aren't resting. They go right on thinking as long as weare awake.

      Our brains slow down a bit when we sleep and dream.{#blank#}3{#/blank#} Instead of thinking wide-awake thoughts, our brains make up dreams. Some dreams are very pleasing. Some are not. Most of thetime we forget them when we wake up.

      Scientists have tried to find out what would happen if people were not allowed to sleep. They asked some people not to go to bed. The people stayed up all night and all the next day. They stayed up the next night too,and the day after. They played games, but they made mistakes. They forgot things.{#blank#}4{#/blank#} The people grew rude and mean. They became angry with their friends. Finally they were too tired to stand up. When they sat down, they fell asleep.

Scientists have found that if people are not allowed to sleep and to dream, they act in an unusual way.{#blank#}5{#/blank#}But we do know that we need it to stay well. So tonight have a goodsleep. Lie down under the covers. Shut your eyes. Let your thoughts wander.Soon you'll stop thinking. You'll be asleep.

A. It was hard for their tired brains to work.

B. When we are awake, they help us pay attention to the worldaround us

C. But babies, children, and adults—all of us need to haveour sleep

D. Good sleep helps to improve one's memory

E. No one knows why sleep is so good for us

F. But even as we sleep our brains are doing some work

G. Of course you will have a good sleep

    Physical education plays a vital role in the students' development and growth. According to recent medical studies, physical well-being of a student is directly related to his or her performance whether in class or in the office. {#blank#}1{#/blank#}

It's a link to good health.

    {#blank#}2{#/blank#} It's only in physical educational classrooms that students learn the value of taking care of themselves through proper grooming, healthy eating and regular exercise.

{#blank#}3{#/blank#}

    Many doctors today agree that obesity is a serious health risk. Without any form of diet management and control with the numerous processed food students intake every day, a student's health can easily be at risk to many diseases. Physical education in school is a preventive measure to teach students the value of regular exercise.

It promotes academic learning.

    Physical health allows students to function better in classrooms. A good cardiovascular system developed from regular exercise promotes excellent blood and oxygen circulation. {#blank#}4{#/blank#} This circulation produces longer attention span during classes allowing longer concentration and absorption.

It builds self-trust.

    Students who are active in physical activities are more confident with themselves according to most social school studies. It's probably because of the self-discipline and dedication to excel in a sport that brings out the best in students. In school, the physical education program introduces these sport activities to students. {#blank#}5{#/blank#}

It promotes a physically active lifestyle.

    The purpose of physical education is to instill in students, at an early age, the value of self-preservation and choosing a lifestyle that is good for both the mind and body.

    Eyesight plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight：

    Schedule yearly exams.{#blank#}1{#/blank#}Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eye- glasses.

    Protect against UV rays. Long-term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses.{#blank#}2{#/blank#}

    Give your eyes a break. Two-thirds of Americans spend up to seven hours a day using computers or other digital products.{#blank#}3{#/blank#}Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20-second break and look at something 20 feet away.

    {#blank#}4{#/blank#}As part of a healthy diet, eat more fruits and vegetables each day. Vitamins C and E help protect eyesight and promote eye health.

    Practice safe wear and care of contact lenses （隐形眼镜）. Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk.{#blank#}5{#/blank#}Otherwise, you may have problems such as red eyes, pain in the eyes, or a more serious condition.

A.Eat your greens.

B.Eye care should begin early in life.

C.They can properly protect your eyes.

D.Stay in good shape by taking more vitamins.

E.Parents usually don't care about their own eyesight.

F.Always follow the doctor's advice for appropriate wear.

G.This frequent eye activity increases the risk for eye tiredness.

    Are you having trouble concentrating when you're reading a book or listening to a lecture? This list of activities might help to improve your study habits.

    Make a List. We often have trouble paying attention to one thing because our brain wants to think about something else. {#blank#}1{#/blank#} You don't worry about whatever else you should be doing.

    Sleep More. Studies show that people who sleep fewer than eight hours a night for a period of time have slower response systems and more difficulty recalling information. {#blank#}2{#/blank#}

    Eat Healthier Foods. Many people enjoy foods high in fats and sugars. {#blank#}3{#/blank#} They might give you a temporary burst of energy. However, that energy is soon followed by a crash.

Reduce Screen Time. This may be the most unpopular suggestion among young people. Screen time — or time spent looking at cell phones, televisions, computer screens, has a clear effect on the attention span. {#blank#}4{#/blank#}

    {#blank#}5{#/blank#} Concentration improves for students who participate in team sports. It could be that being active is helpful in this way. Participating in a sport trains your brain to concentrate on specific tasks, and shut out other thoughts.

A. Be active.

B. Practice more.

C. These foods can provide enough energy for focusing.

D. But these foods can't be helpful enough when it comes to focusing.

E. That is bad news for teens who stay up studying the night before a test.

F. Researchers advise parents to limit it when their children need to be focused.

G. By writing down all the things you need to do, you'll gain a sense of control.

    Perhaps at one point in time, it is acceptable to start any letter or e-mail with "To Whom It May Concern". {#blank#}1{#/blank#} Starting your cover letter or e-mail for a job this way might give the impression that you didn't do your research on who you're writing to. {#blank#}2{#/blank#} After all, people who address other people by their names when writing and speaking to them tend to be more pleasant.

    {#blank#}3{#/blank#} It can be used in letters of recommendation or reference, formal complaints (抱怨) made to a company, letters of introduction, and letters of interest.

Grammarly uses the example of needing to write a letter of recommendation for a colleague who will have to make several copies to distribute to interviewers. {#blank#}4{#/blank#} "In most cases, though, try to narrow your focus rather than cast a broad net," notes  Grammarly. "Ask yourself 'Who does this e-mail concern?' If you can honestly answer 'Anyone', then feel free to use "To Whom It May Concern".(These are the things you should never say in your cover letter.)

    If you do happen to find that using "To Whom May Concern" is appropriate , don't make grammar mistakes, for example , letters or punctuation. {#blank#}5{#/blank#} .

A. You might want to take note of other common errors you might be committing, too.

B. But according to Grammarly, there are four times when it's OK to use this greeting.

C. Making mistakes in writing will surely get you low scores.

D. It's also very impersonal, and some employers might not appreciate it.

E. In that circumstance, sending and receiving letters is more of a formal greeting.

F. However, it may be interesting.

G. Those times have changed, though.

The Feynman Technique(费曼学习法)is a powerful method that you can use to learn anything faster because it forces you to actively think about the problem instead of passively reading or listening to someone else talk about it. You can take the following five simple steps to study better.

·Find out the topic you want to learn. {#blank#}1{#/blank#} Otherwise, you'll end up jumping between topics without developing a deeper understanding of any of them.

·Explain the topic as if teaching a sixth-grader. This step is the heart of the FeynmanTechnique—{#blank#}2{#/blank#}.This requires you to meet the child at their level of understanding by using the simplest way.

.Identify areas of improvement in your explanation. You'll need to critically(批判性地)review the explanation you cane up with in Step Two {#blank#}3{#/blank#}. Try to find any knowledge gaps, together with any areas where you felt that you couldn't explain the topic simply.

·Improve and optimiez(优化) your explanation. Think about all the knowledge gaps and otherareas of improvement you found before. {#blank#}4{#/blank#}

· Repeat the steps until you've achieved mastery of the topic. Keep going through each step you're fully satisfied with your explanation.{#blank#}5{#/blank#}, and that is why going through all the prior snnjust once is usually not enough to achieve topic mastery.

A. Use those to improve your explanation

B. To do so, take a critical look at your explanation

C. Make sure that your explanation is interest-based

D. Your explanations need to be short and to the point

E. The Feynman Technique works best with a repeat

F. It's important that you clearly know the topics you're trying to learn

G. Explaining the topic simply enough to be understood by a sixth-grade student