18．Since the new speed limits .the number of accidents in the area has fallen strikingly．( )A．——青夏教育精英家教网——

18．Since the new speed limits ______，the number of accidents in the area has fallen strikingly．（　　）

	A．	were introduced		B．	introduced
	C．	have been introduced		D．	have introduced

17．Living in the eastern part of the city has its problems，____ shopping is not the least．（　　）

16．A study shows that students living in non-smoking dormitories are not likely to ____ the habit of smoking．（　　）

15．If Joe knew anything about car mechanics，I'm sure he would help us fix the car，but he ______ even less than we do．（　　）

14．Pratt failed many times but he finally ____ to find a successful way to solve the problem．（　　）

13．What's troubling us are not the burdens of our schoolwork but the ways we handle ．（　　）

12．Not until he had been rejected in several job interviews ______to leave this city．（　　）

11．I made every effort to get the car out of the mud，but it remained ______ there．（　　）

10．When a new disease breaks out，experts must what to do in the fastest way．（　　）

9．It was announced that only when the terrible disease was under control _______ to return to their homes．

	A．	the residents would decide		B．	would the residents decide
	C．	would the residents be decided		D．	the residents would be decided

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