哪位英语高手帮我做两个完型吧！奖分20！

就是如下两个简短的完型：
We may not realize it ,but today people live in ( a ) cave called houses These ( )caves provide us with all the necessary (c )as well as security.But in so doing we (d ) other living things of valuable space for their growth because the land is used for our homes, stores, and other buildings .Perhaps (s ) we could (g )( ) ( ) living above ground and (w )to the safety of underground living .There we could replace the sun with artificial lighting and ,(t) ( ) ( )( ) ( ) ,make more land available for farming,air ( ) and so on .We could (s ) getting to countryside by just going above ground when we want to be closer to nature. Besides, living underground could (a )substantially ( ) the preservation of the environment above ground. Nevertheless,( ) you many people have an (I ) dislike for (r ) themselves to underground life. But wht seens (a ) (f ) ( ) to be repulsive may in fact help (s ) our society

To celebrate the 200th birthday of the United Stated o

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