1.________ with the size of the whole earth, the biggest ocean doesn’t seem big at all.

　　A. Compare B. When comparing C. Comparing D. When compared

　　2. ________ the programme, they have to stay there for another two weeks.

　　A. Not completing B. Not completed

　　C. Not having completed D. Having not completed

　　3. According to a recent U. S. survey, children spend up to 25 hours a week ________ TV.

　　A. to watch B. to watching C. watching D. watch

　　4. The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat.

　　A. cause B. being caused C. to be caused D. to have caused

　　5. The flowers ________ sweet in the botanic garden attract the visitors to the beauty of nature.

　　A. to smell B. smelling C. smelt D. to be smelt

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    答案與解析：

　　1. D. 因為the biggest ocean與compare是被動關系，所以要用過去分詞。When compared with…=When the biggest ocean is compared with…=When we compare the biggest ocean with… 故答案為D。

　　2. C. 首先，非謂語動詞的否定式要將not, never等放在非謂語動詞的前面，所以不能選D。其次，由于“沒有完成”與“決定再呆兩周”有先后關系，故用現(xiàn)在分詞的完成式。故答案為C。

　　3. C. 此題考查spend... (in) doing sth 句型。故答案為C。

　　4. C. 因為be believed /thought /supposed /said /reported等后要接動詞不定式，排除A和B;又因為the flu與cause是被動關系，所以要用不定式的被動式。The flu is believed to be caused by...=It is believed /People believe that the flu is caused by...故答案為C。

　　5. B. 一是因為“發(fā)出香味”與“吸引游客”是同時發(fā)生的，且smell 作為連系動詞沒有被動形式，所以答案選B。