Gases from cars are the air of our cities. [ ]A. protecting

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Gases from cars are           the air of our cities.     [     ]
A. protecting
B. poisoning
C. preventing
D. providing

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举一反三

Try not to start every sentence with "the".            the beginning of your sentences.  [     ]
A. Vary
B. Decorate
C. Form
D. Describe

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You"d better        some hot water into the kettle in case the tea cools down.         [     ]
A. add
B. fill
C. fill in
D. put

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根据汉语提示完成句子
Her ankle (肿胀)up after the fall.

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My left cheek is           because of caries.     [     ]
A. swollen
B. swung
C. swept
D. switched

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The most important thing to _in mind when dealing with an emergency is to stay____.   [     ]
A. make; clam
B. keep; calm
C. make; calmly
D. keep; calmly

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