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 . ________ each human being stricken blind and deaf for a few days at some time during his early adult life, it would be a blessing.

A．Is

B．Had been

C．Should

D．Were

4 . 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

5 . Never ________so much protest against the pollution.

A．has there been

B．there has been

C．has it been

D．it has been

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

7 . 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）

8 . _________ that no one was ever prepared for it.

A．So suddenly did the bad news come	B．So suddenly the bad news came
C．So did the bad news come suddenly	D．Did the bad news come so suddenly

9 . 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