12．The air pollution is very serious this morning．Let's indoors．( )A．to stayB．stayC．stayingD．——青夏教育精英家教网——

12．The air pollution is very serious this morning．Let's ______ indoors．（　　）

11．Jenny，you should practice as often as you can ________ the piano competition．（　　）

10．The teacher often asks her students pair work in English classes．（　　）

9．Our monitor didn't feel well last week，but she didn't give up ______ the writing contest．（　　）

8．Most supermarkets in Shanghai have stopped free plastic bags in the past few years．（　　）

7．Mum asked us ______off all the lights when we left the house．（　　）

6．Why not ask others for help when you can't finish ______it by yourself？（　　）

5．The teacher asked the students to consider ________ another word instead of this one．（　　）

4．The volunteers at the airport offer________ heavy luggage for the passengers．（　　）

3．"Why can't China win the football match？"Many Chinese wondered．（合并为宾语从句）
Many Chinese wonderedwhy Chinacouldn't win the football match．

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