用所给词的适当形式填空。

1. Lucy used _____ (be) good at dancing.

2. Is the boy afraid of _____ (go) out alone at night?

3. My parents are _____ (interest) in action movies.

4. Is the little girl _____ (terrify) of meeting new people?

5. The Chinese people are very _____ (friend).

【 】类是提供线程操作和管理的类。