So sudden ________that the enemy had no time to escape.

A. did the attack B. the attack did

C. was the attack D. the attack was

Unsatisfied with the payment, he took the job just to got some work experience.

A. though was he B. though he was

C. he was though D. was he though

I travel to the Binhai New Area by light railway every day, _____ do many businessmen who live in downtown Tianjin.

A. as B. which

C. when D. though

The computer was used in teaching. As a result, not only ______ , but students became more interested in the lessons.

A. saved was teachers’ energy

B. was teachers’ energy saved

C. teachers’ energy was saved

D. was saved teachers’ energy

Some of you may have finished unit one. _____, you can go on to unit two.

A. If you may B. If you do

C. If not D. If so

It was _____ he came bank from Africa that year _________ he met the girl he would like to marry.

A. when; then B. not; until

C. not until; that D. only; when

Only when _______ be possible to sign the papers.

A . does the lawyer come with it

B. the lawyer comes will it

C. has the lawyer come it will

D. the lawyer comes it will

It was announced that only when the terrible disease was under control _______ to return to their homes.

A. the residents would decide

B. would the residents decide

C. would the residents be decided

D. the residents would be decided

— Do you know __________ they got to know each other?

— It was last year ________ they both taught English in China.

A． when was it that; when B． when it was that; that

C． when it was that; when D． when was it that; that

Correct the errors in the following sentences, if .

A． not B． necessary

C． any D． ever