17．-Do you still remember where we first met?-Sure.just in the library．And it at that ti——青夏教育精英家教网——

17．-Do you still remember where we first met？
-Sure，just in the library．And it ___________ at that time．（　　）

16．-It's such hard work!What shall I do？
-You __________ask someone for help．（　　）

15．We could see nothing because the lights suddenly ___________．（　　）

14．-___________!The traffic is moving so fast!
-Don't worry．I will．（　　）

13．-Where are my school clothes？
-Oh，sorry．I have taken __________ by mistake．（　　）

12．Mary said she had never seen ___________ UFO before．（　　）

11．The scientist alwaystriedout（尝试）his new ideas when he was young．

10．Man-made satellites areusedfor（被用来）studying the universe．

9．Many more houses have been built in our countriessofar（到目前为止）

8．It's raining hard but theyare stillbusyworking in the field．（忙着）

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