1 . Never before have we experienced such great changes __________we are having now. (用适当的词填空)

2 . Not only ______ to us the importance of doing the work but they also told us the best ______ it.

A．did they explain; approach to doing	B．had they explained; approach to doing
C．did they explain; way to doing	D．had they explained; way of doing

3 . Next door to ours ______ an old man, who used to be the headmaster in our school.

A．lives

B．live

C．are living

D．is lived

4 . Never ________so much protest against the pollution.

A．has there been

B．there has been

C．has it been

D．it has been

5 . Neither ________ ________ ________friends nor relatives.
他既没有朋友也没有亲人

6 . 只有通过学英语我们才能够开阔我们的视野，增长我们各个领域的知识。(汉译英）

7 . He said before the whole class that only if we put our heart into our lessons _________ great progress.

A．we had made	B．we could make
C．could we make	D．have we made