Yuan Longping, ______ the Super Hybrid Rice was developed, has made great contributions to the society.

A. who                   B. whom                      C. by whom     D. by which

 It’s important to ______ between the habits of a person and the customs of a people.

A. determine    B. identify     C. explore      D. distinguish

Mary is ______ a translation of a French novel.
A.engaged with   B．busy in  C.absorbed to    D．occupied with

Plastic parts can ______ metal ones in many machines. But they don't last long.
A.substitute for  B．be replaced with  C．take the place for  D．in place of

--- My key is gone. Have you seen it anywhere?

--- Oh, it is in the room _______ we had a talk last night.

A. that　　　　 B. which　　　　　 C. where　　　　 D. what

 Exciting as its special effects are _______, there is too much violence in the film.

A. to watch       B. to be watched     C. watching    D. being watched

 ______ the present unemployment continue, the society would face a more troublesome situation.

A. Would         B. Should         C. Might        D. Could

 –What do you think of Nanchang?

－Nowhere else _____ such beautiful scenery.

A. could one find         B. one could find                C. found one               D. one found

 Great changes ______ in the past few years, and a lot of factories ________.

A. had taken place; have been set up       B. have taken place; have been set up

C. took place; have set up                D. were taken place; were set up 

____ is known to us all, ____ water and air are harmful to people’s health.

　 A. That; polluting　　 B. Which; being polluted　

C. As; polluted D. It; to pollute