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1、Jack ________has ________ questions.
2、He is asking Ben some questions _________ the public signs.
3、Can I go_________?
4、You must stay ________from the building.
5、Keep ________ the grass.
6、There is a sign _________ the grass.
7、Please keep __________.
8、We shouldn’t _________ noise here.
9、You __________ go out without a coat. You’ll be cold.
10. Now I know _________ about public signs.
11. You _________ brush your teeth before you go to bed every day.