---______do the students exercise a week ?
---Once or twice.

—          do you exercise?
— Twice a week.

Do you know how to study better and make your study more effective(有效)? We all know that Chinese students usually study very hard for a long 35. This is very good, but it doesn't 36 a lot. An effective student must have enough sleep, enough food, enough rest and exercise. You need to go out for a walk or visit some friends or some nice places. It's good for your study.
When you return  37  your studies, your mind will be refreshed(清醒的) and you'll learn more  38  study better. Psychologists（心理学家）39  that learning takes place in this way. Here take English learning  40  an example. In the first few months you can make progress and you feel happy. Then your language study seems 41  on the same level. So you will think you're learning  42  and you may give up. This can last for days or even weeks, yet you needn't give up. At some point your language study will take another big  43  again. You'll see that you really have been learning all along. If you get enough sleep, food, rest and exercise, studying English can be very effective and interesting. Don't  44  along the way. Learn slowly and you're sure to get a good result.

Do you want to be in good health? Try to do the following things! You can become strong.
Drink eight cups of water every day. Water helps your body in many ways. If you feel……，have a cup of water.
Don’t forget to eat your breakfast. Breakfast gives you everything your body needs for the morning. So do not forget your breakfast.
Calcium(钙). Your bones(骨头) need it. Milk has more calcium. You may also drink orange juice with calcium in it.
Go for a walk every day after meals. Walking is a good exercise, and people need exercise for good health, It’s better to walk after meals.
Stretch for five minutes after sitting for one or two hours. Stretching your arms and legs is good for your body.
Use your brain(大脑) every day. For example, you can do crossword puzzles or read a new book.
Have a rest about twenty minutes when you are tired. You may do something different to have a break. For example，get up and walk. Or sit down to listen to music.
【小题1】How many things does this passage mention for you to do if you want to keep healthy?