5. The doctor told him (什么时间吃药) .

4. You’d better find out (把它放在哪里) .

3. Will you show me (怎样使用这台机器) ?

2. I don't know (接下来做什么) .

1.  (选择那一个) is still ? question.

7. You be careful when you' swim cross the lake.

6. Be quick!If you miss the last train,you will get home by taxi.

5. In some parts of the world,you boil the water before drinking it.

4. When travelling,you take care of your health.

3. You often wait a long time for a bus.