I recognized it was my book ________ I saw the dirty marks on the front cover.

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Everyone ________ , the chairman ________ and the meeting began.

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A．arrived; took his place

B．having arrived; took place

C．came; took the place

D．having arrived; took his place

It is pretty well understood ________ controls the flow of carbon dioxide(二氧化碳) in and out of the atmosphere today.

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—Why didn't Ann see me wave to her?

—She most probably ________ in the other direction.

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The department raised the suggestion that teachers should receive ________ education to catch up with the ________ development in science and technology.

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—Look at that lady on the stage. She's already forty.

—You're kidding. She doesn't look ________.

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—You are to fly to Shanghai alone for the conference tomorrow.

—________? Alone? You don't ________ to say so!

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I just need an umbrella, so ________ will do.

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—Can you persuade him out of the foolish idea?

—________ is no point in doing so— he won't change his mind.

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—Did you look up the time of trains to Shanghai?

—Yes, the early train is ________ to leave at 5:30 a. m.

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