用所给动词的适当形式填空。

1. When I returned home, he _____ (leave).

2. By ten yesterday evening, she    __    (finish) writing.

3. He     _     (study) English for five years before he came here.

4. It     __   (stop) raining when l woke up this morning.

5. I   __     (not read) the book because I had read it before.