19．-Why?You are sitting on my skirt!-I'm terribly sorry．I of that．( )A．am not awareB．haven't——青夏教育精英家教网——

19．-Why？You are sitting on my skirt!
-I'm terribly sorry．I _______ of that．（　　）

	A．	am not aware		B．	haven't been aware
	C．	hadn't been aware		D．	wasn't aware

18．The world's population has grown by six times ______ it was in 1800．（　　）

17．People often have the belief _______ development is bad for the environment，_______does not have to be true．（　　）

16．_______ many developed nations are now concerned about saving nature rather than destroying it，many poorer nations are still using up natural resources at a fast pace to meet the everyday needs of their people．（　　）

15．_______ why he was against cloning humans，the scientist explained that it might lead to disaster．（　　）

14．If we toy with nature，we will have to deal with the _______．（　　）

13．We still have a long way to go _______ all the problems are finally solved in regard to the Yangtze River．（　　）

12．Worldwide，the qualities people consider the most important ______ a friend seem to be the same．（　　）

11．Matthew has been my friend since we were babies and we sit at the same desk in class．But he hasn't spoken to me since our quarrel last week．It's really _______．（　　）

10．---Have you watched the film Mission：Impossible---Rogue Nation？
---_____．But I have been working on my graduation thesis．（　　）

Of course not．

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