12. Our manager is ______________ an important customer now and he will be back this afternoon.

　　A. calling up

　　B. calling in

　　C. calling on

　　D. calling at

　　13. We should take some effective measures to protect our environment and ____________ people to live in

　　harmony with all the living things, which will make our planet more colourful.

　　A. call at

　　B. call up

　　C. call off

　　D. call on

　　14. As I grew up in a small town at the foot of a mountain, the visit to the village ___________ scenes of my

　　childhood. (2006湖北卷)

　　A. called up

　　B. called for

　　C. called on

　　D. called in

　　15. In case of an emergency, one should stay ___________ and take immediate action if necessary.

　　A. cautious

　　B. calm

　　C. busy

　　D. careful

　　16. After our government launched a _____________ to popularize (普及) Chinese language worldwide, lots of

　　Confucius colleges have appeared in foreign universities.

　　A. caution

　　B. catalogue

　　C. campaign

　　D. camp

　　17. You cannot be ___________ careful when you drive a car. Traffic accidents often arise from careless driving.

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