3．At night.plants carbon dioxide and at the same time oxygen．So.we may put some in——青夏教育精英家教网——

3．At night，plants _________carbon dioxide and at the same time _________oxygen．So，we may put some in our bedrooms to purify the air．（　　）

	A．	take in，give out		B．	take up，give off
	C．	take in，give in		D．	take off，give up

2．Only in this way _______ make progress in your math．（　　）

1．Contrary to what many people might assume，evidence shows that sharks seldom attack humans．
（与许多人可能假设的情况相反）

20．It turned out that their bodies nearly completely broke down and disappeared，leaving empty space in ash．
（在灰烬中留下了空间）

19．It was not until liberation that _________ to his hometown．（　　）

was he returned

18．I've had a hard life，but it is nothing compared with the hardships that my father ________．（　　）

17．_____ your attention focused on practicing，and you can reach your goal of becoming an excellent pianist．（　　）

16．The orange looks dry，but you may be able to ____ a few drops．（　　）

15．________ my wife ________ I myself was able to teach my son to sing the song，so we asked one of our friends for help．（　　）

	A．	Not only； but also		B．	Both； and
	C．	Either； or		D．	Neither； nor

14．I saw the boy ________ the road to get the rolling football on the other side of it．（　　）

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