---Must we leave the classroom now?

---No, you _____. You _____ leave after the bell rings.

A．mustn't; are allowed to                   B．don't have to; might

C．needn't; can                           D．can't; are supposed to

Rose, you       leave your school things on the floor like this. Keep your room clean and tidy.

A．may not           B．mustn’t          C．needn’t         D．wouldn’t

---Must I hand in my exercise book now, Mr. Zhao?

---No, you ______. You may give it to me tomorrow.

完形填空（共15小题；每小题1分，计15分）
阅读下列短文，从文后各题所给的四个选项中选出一个最佳答案。
Do you know how to study __1__ and make your study more effective (有效的)?　We all know that Chinese students usually study very hard for long　__2__, This is very good ,but it doesn’t__3__a lot ,for an effective student must have enough sleep ,enough food and enough rest and __4__. Every day you need to go out for a walk or visit some friends or some nice places. It’s good for your__5__.
When you return __6__your studies, your mind will be refreshed(清醒)and you’ll learn more__7__study better. Psychologists (心理学家)　__8__ that learning takes place this way. Here take English learning __9__ an example. First you make a lot of progress（进步）and you feel happy. __10__ your language study seems to stay the same. So you will think you’re learning nothing and you may give __11_. This can last for days or even weeks, yet you __12__ give up, and at some point your language study will again take another big __13__. 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 __14_ . Don’t give up along the way. Learn __15__ ,you are sure to get a good result(结果).

—Must I finish my homework now?

—No,you        .