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Every evening after dinner, if not______ from work, I will spend some time walking my dog.                                  

A. being tired     B. tiring        C. tired         D. to be tired

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The missing boys were last seen____ near the river.

A.     playing  B. to be playing  C. play  D. to play

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 Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

A. it, it                    B. what, what

C. it, what               D. what, it

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He must be helping the old man to water the flowers,______ ?      

A. is he     B. isn’t he     C. must he     D. mustn’t he

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When I worked as the general manager of the firm, I sometimes had _____ to visit London on business.

        A. opportunity       B. possibility       C. occasion      D. chance

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He didn't _____ what I read because his mind was on something else.

         A. hold on    B. catch on    C. take in    D. get over

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They decided to leave the waiter a big _____ because the food and service had been excellent.

         A. note         B. reward         C. tip         D. gift

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I think we should let Maria go camping with her boyfriend. _____, she's a big girl now.

          A. Above all       B. After all       C. First of all      D. For all

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I was out of town at the time, so I don’t know exactly how it _______. 

A. was happening        B. happened       C. happens       D. has happened

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Many children,______ parents are away working in big cities,are taken good care of in the village.

A. their              B. whose         C. of them           D. with whom

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