用括号内所给单词的适当形填空。

1. Restaurant owners have learned from _____ (science) studies.

2. Her mother makes her_____ (run) 800 metres around the playground every day.

3. They were very _____ (surprise) to see her again after 15 years.

4. Some advertising can _____ (lead) you. Let's say, an ad can lead you to buy something you don't need

    at all.

5. You have to pretend _____ (like) the gift, though you don't like it.