1 . The whole building _______ _______ _____(变成了废墟) after a terrible earthquake.

2 . Had Paul received six more votes in the last election, he ______________________ (be) our chairman now.

3 . Tickets may___________(purchase) in advance from the box office.

4 . There ______(be) no buses, we had to walk there.

5 . There are 60 students in our class,                       girls. (be )
我们班有60人，其中三分之一是女生。

6 . Peter and I ______ friends for three years. We first got to know each other at a Christmas party. But we ______ each other a couple of times before that.

A．have been; had seen	B．have become; had seen
C．have been; saw	D．have become; have seen

7 . As all we know, police ________(be) people who catch thieves and robbers. （所给单词适当形式填空）

8 . The first thing you must remember is that in order to succeed, it is almost compulsory that you ______ optimistic.

A．be

B．are

C．must be

D．have been