The thieves _____ him _____ in the park, took his wallet and escaped.

　　A. held .. back      B. held .. up   C. held .. on        D. held .. out

All too _____ it was time to go back to school after the glorious summer holidays.

　　A. often    B. fast    C. soon    D. late

　 Bill is not a fast runner and he doesn't have a chance of winning the marathon, but he will _____ the race even if he finishes last.

　　A. keep on    B. keep to    C. stick out    D. stick to

He hated the war so much that he decided to leave the army _____.

　　A. for long    B. once in a while  C. for good    D. once upon a time

He has recently _____ chess to provide himself with some relaxation.

　　A. taken on B. taken up  C. held on D. held up

As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.

　　A. exposure  B. distribution  C. expansion  D. emission

I feel sure that _____ qualification, ability and experience, you are abundantly suited to the position we have in mind.

　　A. in case of           B. in terms of

　　C. in the opinion of    D. in the course of

When products made in factories _____, they are thrown away as garbage.

　　A. come to an end    B. are put to use   C. are used up       D. wear out

The government placed _____ on the numbers of foreign cars that could be imported.

　　A. limitations     B. restraint  C. requirements    D. restrictions

54. These plastic flowers look so _____ that many people think they are real.

　　A. beautiful    B. natural    C. artificial    D. similar