16. —Have you heard_____ news? The price of _____ petrol(汽油) is going up again!
A. the ；the B. /; the C. the; / D. /; /
17. Why dinosaurs died out still remains a ______, which reminds human beings of keeping wildlife free from being disturbed.
A. problem B. surprise C. puzzle D. question
18. —Shall I take this seat? —Certainly _____.
A. you may B. you shall C. you must D. you should
19. What I really want to know is _____ she is leaving, so that I may be in time to see her off at the airport.
A. when B. where C. how D. what
20. —Why did your headteacher ask you to go to her office?
—She wanted me to _____ my failing to hand in the exercise in time.
A. leave for B. care for C. answer for D. account for
21. A new mayor from America came all the way to Taizhou for developing friendship _____ for making money.
A. rather than B. other than C. better than D. more than
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