Here are four clothing stores.

Notes: £ means the cheapest; £ £ £ £ means the most expensive;

★ means friendly; ★★★★ means the friendliest

    Welcome to our museum(博物馆). It is free and you can come only with your ID card. We don't ask you for any money, but we have some rules for you.

    First, don't bring any food to the museum. You can't eat in the museum. But you can bring some water to the museum. Second, you can take photos here, but you can't touch (触摸) the things. Third, keep quiet in the museum. Don't talk loudly. Fourth, don't run in the museum. Finally (最后), our museum closes at half past five in the afternoon. Please leave before five and we need thirty minutes to do some cleaning. Have a good time here! Thank you.

Dear sister,

I've been happy here in New York. But when holidays are coming near, I really feel "There's no place like home", just like the English proverb says, "East, west, home is the b{#blank#}1{#/blank#}."

You must be doing well in English class. The letter you sent to me was written in good English.

Well, I want to i{#blank#}2{#/blank#} my friend Diana to our home. I dare not tell Mama directly. If Dad and Mum say that will be all right, please write to me as soon as possible.

Diana is a poor girl whose parents died last month in a terrible accident. She has to spend the holidays alone. She wants to see China and try e{#blank#}3{#/blank#} that we Chinese do. She p{#blank#}4{#/blank#} speaking Chinese for two years and can speak a little now. She has great curiosity about our family life and will ask you many questions about it. Isn't it a good chance to u{#blank#}5{#/blank#} each other? I'm sure you'll learn many things from her.

Please give my love to our father and mother!

Your sister,

Mei

①Eating good food and getting proper exercise are important to stay healthy. Getting enough sleep is important, too. Experts say that teenagers between the ages of 15 and 20 need 8 to 10 hours of sleep each night. 

②Your body needs to take a rest from all the activities it has done during the day. Your brain needs a rest, too. You are likely to get sick easier without enough sleep. 

③You have a "24-hour clock" inside your body that tells you when to be awake and when to go to sleep.  ▲  Blue light that comes from the Sun tells your brain to keep you awake during the day. When there is no blue light at night, the brain tells the body that it's time for sleep. 

④There are many things that stop the brain from telling your body when it's time to sleep. One of these is blue light at night. Today, people spend a lot of time watching television or looking at screens on computers or smart phones. These devices (装置) give off blue light. If you look at them at night, the blue light can trick your body into thinking it's daytime. Then it is more difficult to go to sleep.

⑤What should you do to get good sleep? Experts say that you shouldn't look at screens that give off blue light for at least one hour before going to sleep. 

⑥ Do not watch TV or use anything with a computer screen in bed. If you need to do something to fall asleep, it is better to read a book. Also, keep your bedroom as dark as you can. This will help you sleep well.