One should always ________his promise.

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Someone is ringing the door-bell. Go and see ________.

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________, I would give it up early.

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Tom couldn't go to school, ________ find a job.

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Not until Mr. Smith came to China ________ what kind of a country she is.

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Hardly ________ the people ran toward it.

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A．had the plane landed when

B．had the plane landed than

C．the plane had landed when

D．the plane was landing than

________ that even people in the next room could hear him.

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A．So loudly did he speak

B．Such loudly did he speak

C．So loudly he spoke

D．Such loudly he spoke

We were lucky, for no sooner ________ home ________ it rained.

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A．we turned... and

B．did we return... when

C．after we returned... and

D．had we returned... than

No sooner had the bell rung ________.

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A．when the class began

B．while the class was beginning

C．then the class was going to being

D．than the class began

________ than they started to work.

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A．No sooner they had got to the plant

B．No sooner had they got to the plant

C．As soon as they had got to the plant

D．When they had got to the plant