单项选择题

（）no gravtity,there would be no air around the earth,hence no life.

A.If there had been
B.If there was
C.Had there been
D.Were there

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单项选择题
Some members of the committee suggested that the meeting（）.

A.being postponed
B.to be postponed
C.be postponed
D.postponed
单项选择题
Making energy use completely harmless to the environment（）very difficult and usually economically expensive.

A.is
B.are
C.have been
D.shall be
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