III. Put the verbs in brackets into the correct tenses.
Not/ finish, correct, can buy, be, call, smoke, not receive, write,
1.I ____________ to my pen pal two months ago, but I ____________ his reply since then.
2.If the weather ____________ nice tomorrow, we will go for a picnic.
3Don’t worry, I ____________ you as soon as I come back home.
4. Last year, he used ……………………… 20 cigarettes a day.
5. This exercise must ……………………… by the teacher.
6.. Thu and her friend ……………………... their work yet.