It is the prevention of disease ________ its successful treatments that has led to the rapid increase of the world's population.

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How do you like the books?

Oh, they are wonderful. People here think ________ of the books.

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Whom do you want to see at the moment?

The man ________ Mr. Li.

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Mr White didn't come last night, did he?

No. We ________ for him. A whole night was wasted.

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We'll get more money in the years ________.

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________ is mentioned above, the number of the students in senior high school is increasing.

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There was a terrible noise ________ the sudden burst of light.

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May I ________ that a plan should be made for this term's study?

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________ has helped to save the drowning girl is worth praising.

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After everybody ________, the concert began.

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