I'm sorry, sir. Your recorder isn't ready yet. It ________ in the factory.

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An exhibition of paintings ________ at the museum next week.

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Teschers ________ in every part of the world.

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No permission has ________ for anybody to enter the build-ing.

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I ________ ten minutes to decide whether I should agree to the plan.

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John and I ________   friends for eight years. We first got to know each other at a Christmas party. But we ________ each other a couple of times before that.

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His new book ________ next month.

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The ground was wet and ________ last night.

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A．it must be mining

B．there must have rain

C．it must have rained

D．there might have been rain

Can such a thing ________ happening again?

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This kind of cloth ________ soft enough.

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