一、从括号中选出正确的词填空，使句子完整。
1. You (should/shouldn't) cross the street when the light is red.
2. We (should/shouldn't) wash our hands before eating.
3. He (should/shouldn't) play with fire. It's dangerous.
4. They (should/shouldn't) listen to the teacher carefully in class.
5. We (should/shouldn't) shout in the library.

1. shouldn't 2. should 3. shouldn't 4. should 5. shouldn't

二、连词成句。
1. should/help/we/others/.

2. you/on/desk/jump/the/shouldn't/.

3. say/should/she/to/my/sorry/brother/.

1. We should help others. 2. You shouldn't jump on the desk. 3. She should say sorry to my brother.

三、根据情境选择最合适的句子。
（）1. 当你想提醒同学饭前要洗手，你应该说：
A. You shouldn't eat. B. You should wash your hands first.
C. You shouldn't run.
（）2. 在图书馆里有人说话太大声，你可以说：
A. You should be quiet. B. You should sing. C. You should dance.
（）3. 下雨天骑车去上学，你应该怎么做？
A. I should wear a raincoat. B. I should ride fast.
C. I should hold an umbrella.

1. B 2. A 3. A