20．Half of the Beijing's private cars off the roads due to heavy smog on Friday．( )A．orderB．are——青夏教育精英家教网——

20．Half of the Beijing's private cars ____ off the roads due to heavy smog on Friday．（　　）

19．Please ____ fruits and vegetables in a basin!（　　）

18．_____ can we help victims after a natural disaster？（　　）

17．The police required the traveler ____ for his luggage．（　　）

16．When we ____ home last night，we saw a strange object in the sky．（　　）

15．We'll have to cancel the school sports meeting ___ it snows tonight．（　　）

14．It was a terrible journey，____ we got there safely in the end．（　　）

13．I ____ 30pages of the book so far，but I hope to finish it by next week．（　　）

12．The sign says"Passengers ____ show their tickets and passports．"（　　）

11．I don't mind _____back home．I feel like some fresh air．（　　）

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