His whole school education ________ only 2 years because of his illness．

A．added up

B．added up in

C．added up to

D．was added up

To improve your spoken English, you'd better listen to the tape ________．

A．generally

B．fluently

C．frequently

D．gradually

Some people do not have enough to eat while some others throw away food just ________ its poor taste．

A．because of

B．according to

C．instead of

D．in spite of

To me, cycling at ________ altitude of more than 4,000 meters was ________ unforgettable experience．

A．the; an

B．an; an

C．/; a

D．an; /

I have many friends, ________ three are well known for their singing popular songs．

A．of who

B．of whom

C．of which

D．of them

Mr．Smith closed all the windows while driving ________ he wouldn't catch a cold．

A．as if

B．so that

C．because

D．though

When the manager came in, the workers pretended ________ hard on their machines．

A．to work

B．to be working

C．to have worked

D．working

He can ________＄ 3, 000 a year by writing stories to support a family of three people．

A．spare

B．afford

C．earn

D．charge

On April 1st the westerners like to play ________ on each other but they make sure that no one is hurt．

A．games

B．fun

C．hobbies

D．jokes

We are often warned that smoking ________ great harm to our health．

A．does

B．leaves

C．makes

D．gives