用括号内所给单词的适当形式填空。（5分）

1. He shows great interest in _________ (chat) with his classmates by QQ.

2. I prefer _________ (music) who play many different kinds of songs.

3. If I had a million dollars, I’d give it to _________ (medicine) research.

4. John _________ (drop) his wallet on the ground while walking on the road.

5. Please speak ___________ (clear), or others can’t catch what you mean.

路径测试是整个软件测试的柱石，它是对软件的 【4】 进行测试的一种方法。