根据句子的意思，补全单词。

1. The old woman often stays at home and watches TV, so she has a small           _ of very good friends.

2. My grandfather is a _        _ man in Chinese history, and you can ask him for help when you learn

    Chinese history.

3. Some students in our class are working on the farm, and the _           are studying in the classroom.

4. Cheng Long is a famous Chinese actor.  He _         _ Chinese Kungfu.

5. We had a good harvest in our crops because of _           rain in our hometown last year.