Tom killed the cat. I'll ask him why ________.

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Lanzhou is no longer ________.

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This is ________ the term “cat's paw”has come into use.

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________ this material can be used in our factory has not been studied yet.

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________ we need more practice is quite clear.

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He tells me that he ________ back yesterday.

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They had the machine ________ all the night.

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Since none of us could work out the problem, we had our teacher ________ it.

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I'd love a cup of tea, ________ she.

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“I can't remember his name.”“________.”

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