Every ________ been tried to save the patient．

A．mean has

B．means has

C．mean have

D．means have

For all these years I have been working for others．I'm hoping I'll ________ my own business someday．

A．turn up

B．fix up

C．set up

D．make up

The American Civil War lasted four years ________ the North won in the end．

A．after

B．when

C．before

D．then

Scientists say it may be five or six years ________ it is possible to test this medicine on human patients．

A．since

B．after

C．before

D．when

－How long do you think it will be ________ China sends a manned spaceship to the moon?

－Perhaps two or three years．

A．when

B．until

C．that

D．before

－Why didn't you tell him about the meeting?

－He rushed out of the room ________ I could say a word．

A．before

B．until

C．when

D．after

Someone who lacks staying power and perseverance is unlikely to ________ a good researcher．

A．make

B．turn

C．get

D．grow

I don't ________ rock'n'roll．It's much too noisy for my taste．

A．go after

B．go away with

C．go into

D．go in for

He was educated at the local high school, ________ he went on to Beijing University．

A．after which

B．after that

C．in which

D．in that

This is the very reason ________ he explained to me just now．

A．why

B．that

C．for which

D．of