用括号内所给单词的适当形式填空.

1. Mrs Zhang            (be) a driver twenty years ago.

2. Liu Hai is our teacher.  He            (teach) English.

3. —Was your grandpa a teacher? 

    —Yes, he was. He      ___ (teach) Chinese.

4. I           (read) a book at home yesterday.

5. Chen Hai            (study) art very hard five years ago.

6. Her mother             (walk) to work the day before yesterday.