Though he knew little about the research work that had been done, he succeeded ________ other more well-informed scientists failed.

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I try to understand ________ that prevents so many young people from being a happy as one might expect.

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Don't let the child who is ________ climb such a high mountain .

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Their homework ________ , Tim and Joe went to play football.

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So carelessly ________ that you nearly killed yourself. So ________ more careful next time.

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—Your telephone number again? I ________ quite catch it.

—It's 9658442.

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Can't you tell me anything about the earthquake ________ here several weeks ago?

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She is too thin. She________ gain some weight but she________ little every day.

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The young man rushed to the hospital________ he heard the bad news.

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Is this research center________ you visited the modern equipment last year?

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