一、完成句子,每空一词
1. Students ______ ______ ______ (应当被允许) to go out with friends on Sundays.
2. My parents ______ ______ (允许我) to watch TV on Sunday evenings.
3. All the work ______ ______ ______ (应该做) as soon as possible.
4. Waste-paper ______ ______ ______ ______ (不应该扔) here and there.
5. Can rice ______ ______ (种植) in the south of China in winter?

1. should be allowed 2. allow me 3. should be done 4. shouldn't be thrown away 5. be grown

二、按要求完成下列句子
1. The flowers can be watered every day. (改为否定句)
The flowers ______ ______ watered every day.
2. A dictionary can be used in the exam. (改为一般疑问句)
______ a dictionary ______ ______ in the exam?
3. This radio can be mended in the store. (完成附加疑问句)
This radio can be mended in the store, ______ ______?
4. We should allow children to go shopping on weekends. (改为被动语态)
Children ______ ______ ______ to go shopping on weekends (by us).
5. The classroom should be cleaned once a day. (就画线部分提问)
______ ______ ______ the classroom be cleaned?

1. can't be 2. Can；be used 3. can't it 4. should be allowed 5. How often should