6．She sat beside the door quietly， into the distance.

　　解析：考查非谓语动词。句意：她静静地坐在门口，看着远方。She与look之间为逻辑上的主谓关系，故用动词­ing形式作伴随状语。

　　7．What the book so popular is the creative imagination of the writer.

　　解析：考查主谓一致与时态。句意：使得这本书如此受欢迎的是作者富有创意的想象力。分析句子结构可知，从句中的主语是What，属于第三人称单数，且此处描述的是客观事实，所以谓语动词应用一般现在时单数。

　　8． he could work out the difficult problem by himself is still unknown.

　　解析：考查主语从句。句意：他能否自己解出那道难题还不知道。根据句意可知，That要改为Whether，表示"是否"。

　　9．There are many stars in the sky that it is impossible to count them.

　　解析：考查句型。句意：天上的星星太多了，根本数不过来。分析句子结构可知，本句是so...that...结构，表示"如此......以至于......"，所以将too改为so。

　　10． one of you breaks the window will have to pay for it.

　　解析：考查主语从句。句意：你们中无论哪个人打破窗户都得赔偿。whatever无论什么，指物；whichever无论哪一个，既可指人也可指物。此处表示范围，故用Whichever。

　　Ⅲ.阅读理解

　　In July 1994 Jupiter，the largest planet in our solar system，was struck by 21 pieces of comet(彗星)．When the fragments(碎片)landed in the southern part of the giant planet，the explosions were watched by scientists here on earth.But what if our own planet was hit by a comet?

The year is 2094.It has been announced that a comet is heading towards the earth.Most of it will miss our planet，but two fragments will probably hit the southern part of the earth.The news has