6．encourage( )A．countB．shoulderC．youthD．country——青夏教育精英家教网——

6．encourage（　　）

5．celebrate（　　）

4．century（　　）

3．-How did it come that you damaged your car so badly？
-I ____ into a tree on the roadside the other day．（　　）

2．Air pollution，together with littering，____ many problems in our large industrial cities today．（　　）

1．____ the flight to Beijing will be delayed is ____ I'm especially worried about．（　　）

Whether； that

Whether； what

20．-I'll be able to come to see your performance at 8：30 tomorrow evening．
-I'm sorry，by then my performance ____ and I ____ reporters in the meeting room．（　　）

	A．	will be ended； will meet
	B．	is to end； will meet
	C．	will have ended； will be meeting
	D．	will end； am going to meet

19．David applied for the position three times ____ he finally got it．（　　）

18．Many questions have been answered by John．He must have previewed the lessons last night，____ he？（　　）

17．_____ scores of times，but Derek still couldn't understand how to use past participle in a concrete situation．（　　）

	A．	Having explained		B．	Having been explained
	C．	Though it was explained		D．	It was explained

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