A. circulated

　　B. charged

　　C. chosen

　　D. checked

　　13. Guests must __________ before noon, or they will be charged for the day.

　　A. check out

　　B. check on

　　C. check in

　　D. check over

　　14. After _________ at the hotel, you should deposit valuables at the front desk for fear that you should lose them.

　　A. checking out

　　B. checking on

　　C. checking over

　　D. checking in

　　15. A true friend should be one who always ____________ you up when you are in low spirits.

　　A. claps

　　B. changes

　　C. cheers

　　D. checks

　　16. Family has a great influence on our personal development. If we are from a happy family, we tend to be

　　___________ and optimistic.

　　A. classical

　　B. cheerful

　　C. changeable

　　D. chief

　　17. He __________ over the problem for several days before making his decision.

　　A. checked

　　B. chewed

　　C. catered

　　D. choked

　　18. The __________ reason for the great changes in the cultural field is the development of economy.

　　A. classical

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