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__ carefully if any change occurs when doing experiments in the lab..

A．Observe	B．To observe
C．Observed	D．Observing

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I will certainly be surprised if he ______ to tell them what he knows.

A．dare

B．will dare

C．dared

D．dares

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_____ you make a little room for me?

A．Should

B．Could

C．May

D．Must

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I am told that her father is in London and ______ a dry-goods store.

A．has kept

B．kept

C．keeps

D．had kept

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He ______ English for six years by the time he takes his examination.

A．was studying	B．would have been studying
C．had been studying	D．will have been studying

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George has arrived, but I did not know he ______ until yesterday.

A．comes

B．will come

C．is coming

D．was coming

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