题目内容：

用所给词的适当形式填空

1.My sister       ________(write) three English e-mails since last week.

2.We went to the bookstore ____________(buy) books yesterday.

3.I think it must be an ________________ (enjoy) job.

4.I will tell you when he _________(come) back tomorrow.

5.Brian walked on the street alone. Then he said to _________ (he):“I am lost”.