请大家给我一些习思4级考试的参考题目

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http://edu.sina.com.cn/cet/index.shtml

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The fire was finally bought under control, but not______extensive damage had been caused.
A.after B.before C.since D.as
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Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do.He finally concluded that the constituent 1 must exist in the form of 2 particles or atoms and that these 3 be completely mixed together in the 4 .This threw a new light in 5 laws of definite proportions.It was 6 necessary to suppose that the atoms 7 combinesintossmall groups of uniform 8 and so form more complex substance; 9 the mystery of this law was 10 .Dalton suggested, for example, that carbon monoxide 11 formed bythe one w