1. Have you decided ________ (怎样度假).
2. It is dangerous ________ (玩火).
3. She was the first woman ________ (环球飞行的).
4. The boy was made ________ (重复他自己的故事).
5. The old lady looked at the children ________ (穿过马路).
6. It took me much time ________ (算出这些难题) yesterday.
7. The boss made the workers ________ (一天工作十小时).
8. I don't know ________ (在会上说什么).
9. Can you tell me ________ (在哪里能买到这本书)?
10.________ (在何时何地召开这会议) hasn't been decided yet.

1. 城里的人们有时会去乡下享受自然风景。
    People in the city sometimes go to the countryside _____ _____ _____.
2. 现在人们会通过发送电子邮件来彼此交流。
    Nowadays people send e-mail _____ _____ _____ each other.
3. 在美国人们通过握手来表示问候。
    In the United States, people _____ _____ _____ _____ their greetings.
4. 那个老太太看着孩子们过马路。
    The old lady looked at the children _____ _____  the street.
5. 昨天我花了很长时间算出这些难题。
    It took me much time _____ _____ _____ these problems yesterday.