Lying in bed, I listened to the heavy rain ________ the window.

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The professor ________ some good advice ________ our study of English.

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Man________ die without air or water.

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She is ________ weak that she cannot lift the box.

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Young scientists are often ________ to do experiments.

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I wonder why you ________ the same mistake. I’ve told you again and again.

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Mrs Green said she would leave for Shanghai ________.

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Could you give me some advice on how to ________ a foreign language in a short time?

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By the time he was ten, Edison had already built a lab of ________.

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Miss Gao encouraged us ________ exercises every day.

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