You will be late ______ you leave immediately.

A. unless 　 B. until　 C. if 　 D. or

As middle school students, we _____ the police to keep order.

A. are used to help 　 B. used to helping

C. used to help 　 　 D. used to be helped

He talked a lot about things and persons ________they remembered in the school.
A. which B. that C. whom D. what

The computer center,_____ last year, is very popular among the students in this school.

A. open　　　 　　　 B. opening　　　 C. having opened　　 D. opened

Deng Xiaoping put forward the policy of “reform and open?door” in 1978, ________ China has witnessed great changes.

A．when B．since when

C．since then D．during which

—What do you think of Miss Evens' works?

—They have ________ our understanding of these difficult subjects.

A．contributed to 　　　　 B．attended to　　　

C．devoted to 　　　　　　 D．look forward to

By playing with the native boys and girls，one can________a lot of their language.

A．pick up 　　　　　B．set up　　　　　 C．build up 　　　　D．put up

The book is of great value. ________can be enjoyed unless you digest it.

A. Nothing　　　　 B. Something　　　　 C. Everything　　　　　 D. Anything

--- An explosion at a coal mine killed at least 62 workers and left another 13 missing.

  --- Yes, _________  news came as ________ shock to us all.

A. the; the　　 B. /; /　　　　　　 C. /; a　　　　　　 D. the; a

If I were in 　　　position of the mayor .,I wouldn’t allow 　　　 factory like this standing in the center of the town

A a; the　　　　　　　 B, the ;\　　　　　 C the ; a　　　 D. \ ; the