15．Everything was placed exactly he wanted it for the graduation ceremony．( )A．whileB．whe——青夏教育精英家教网——

15．Everything was placed exactly ___________he wanted it for the graduation ceremony．（　　）

14．Parents and children should communicate more to ________the gap between them so that they can understand each other better．（　　）

13．The three of us___________around Europe for about a month last summer．（　　）

12．He got up late and hurried to his office，_________the breakfast untouched．（　　）

11．It's quite warm here； we __________turn the heating on yet．（　　）

10．Only after Mary read her composition the second time_________ the spelling mistake．（　　）

does she notice

she has noticed

9．You were working too hard．You'd better keep a ________between work and relaxation．（　　）

8．It's surprising that your brother _____ Russian so quickly-he hasn't lived there very long．（　　）

7．I got close enough to hear them speaking Chinese，and I said"Ni Hao"just as I ____ do in China．（　　）

6．Scientists study ____ human brains work to make computers．（　　）

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