6．She studies hard all the time, she never gives up ．( )A．studyB．to studyC．studyingD．to studying——青夏教育精英家教网——

6．She studies hard all the time； she never gives up ．（　　）

5．The air pollution caused the of many trees in this area．We should take care of the environment．（　　）

4．Did you and your brother do any housework at home last weekend，Sally？
-_________ did，because we went out for a trip with our parents．（　　）

3．Don't waste water again，or we'll it one day．（　　）

2．-What do you volunteer ？
-I work at the hospital．（　　）

1．Thank you for me the good news（　　）

20．I used to ______ to school，but now I am used to ________ to school by bike．（　　）

walking；going

19．Sam____________ and hurt his leg when he played volleyball yesterday．（　　）

18．无论我多忙，我都会去参加你的生日聚会．
Nomatterhow busy I am，I will go to your birthday party．

17．小宝宝是如此地疲惫以致于他很快就睡着了．
The baby was so tired that hefellasleepvery quickly．

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