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6. He is the only one of the students who _________(be) a winner of scholarship for three years. 谓语应与the only one一致，又由for three years可知用完成时。 7. Every possible means _____________(use) to prevent the air pollution, but the sky is still not clear. 由every可知means是单数, 由语境可知用完成时。 have been used has been 8. When and where to go for the on-salary holiday _________________ (not, decide) yet. 不定式作主语，谓语用单数；由yet可知用完成时。 9. She has set a new record, that is, the sales of her latest book _____________(reach) 50 million. 主语是复数sales；又由前句的has set可知用现在完成时态。 has not been decided have reached 10. Professor Smith, along with his assistants, ___________(work) on the project day and night to meet the deadline. 主语Professor Smith是单数，又由语境可知用现在进行时。 is working 11. He _______________ (pretend) that a tiger toy was real and giving it a voice. 在主格he后，pretend是谓语动词，又由与之并列的giving可知，是过去进行时，主语是第三人称单数，故填was pretending。 was pretending 12. “Your father has at last decided to stop smoking.” Jane ______________ (inform). 在主语Jane后的inform应是谓语动词，Jane与inform是被动关系，要用“be +过去分词”；由语境可知是一般过去时，主语是第三人称单数，故was informed。 was informed | 
