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
答案与解析：
1. D. 因为the biggest ocean与compare是被动关系，所以要用过去分词。When compared with…=When the biggest ocean is compared with…=When we compare the biggest ocean with… 故答案为D。
2. C. 首先，非谓语动词的否定式要将not, never等放在非谓语动词的前面，所以不能选D。其次，由于“没有完成”与“决定再呆两周”有先后关系，故用现在分词的完成式。故答案为C。
3. C. 此题考查spend... (in) doing sth 句型。故答案为C。
4. C. 因为be believed /thought /supposed /said /reported等后要接动词不定式，排除A和B;又因为the flu与cause是被动关系，所以要用不定式的被动式。The flu is believed to be caused by...=It is believed /People believe that the flu is caused by...故答案为C。
5. B. 一是因为“发出香味”与“吸引游客”是同时发生的，且smell 作为连系动词没有被动形式，所以答案选B。
本文选自新东方在线论坛。
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