Althoughthecausesofcancer,wedo

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Although the causes of cancer ________, we do not yet have any practical way to prevent it．

A．have uncovered	B．have been uncovering
C．are uncovering	D．are being uncovered

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As usual，he put on a show as though his trip __________a great success.

A．had been

B．has been

C．were

D．was

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The teacher suggested that her students__________experiences with ESP.

A．write a composition on their

B．to write composition about the

C．wrote some compositions of his or her

D．had written any compositions for his

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George would certainly have attended the meeting，__________.

A．if he didn’t get a flat tire	B．if the flat tire hadn’t happened
C．had he not had a flat tire	D．had the tire not flattened itself

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I hadn’t expected__________James to apologize but I had hoped.

A．him calling me	B．that he would call me
C．him to call me	D．that he call me

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If the Watergate Incident__________Nixon would not have resigned from the presidency.

A．did not occur	B．had not occurred
C．was not occurring	D．be circling

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