The air pollution is serious, ________ we must try our best to reduce it.

A. so B. or C. if

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完形填空

Charlie and Jackie joined a wholesale company together just after graduation. They both worked very hard. After several years, the boss made Jackie sales manager but Charlie there to be a salesman. One day Charlie could not take it any more. He handed in his resignation letter (辭職信) to the boss and that the boss did not value hardworking employees(雇員), but only raised those who tried to please him. He thought that it was really .

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1.A. made B. became C. remained D. kept

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9.A. total B. lot C. pile D. number

10.A. taken B. come C. bought D. heard

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13.A. while B. though C. unless D. since

14.A. see B. think C. know D. win

15.A. far B. long C. soon D. Wide

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