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Every possible means ________ to prevent the air pollution，but the sky is still not very clear.

A．were using	B．have used
C．has been used	D．was used

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I haven’t finished my report, but I promise I ______ it by the end of the week.

A．will finish	B．have finished
C．will be finishing	D．will have finished

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It's a custom in China to have some tea or other drinks before the meal ________.

A．serves	B．served
C．was served	D．is served

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—What’s all that noise about outside?
—Oh, I forgot to tell you. The road to the railway station ______.

A．will be widened	B．is to be widened
C．has been widened	D．is being widened

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Since the time humankind started gardening, we _____to make our environment more beautiful.

A．try	B．have been trying
C．are trying	D．will try

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We won’t start the work until all the preparations __________.

A．are being made	B．will be made
C．have been made	D．had been made

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