16. The police set a ________ to catch the thieves.
A) plan B) device C) trap D) trick
17. We have to try every means to ________ the costs of the construction project.
A) bring off B) bring forth C) bring down D) bring back
18. The students were participating ________ an international energy-saving competition between towns in New England and Canada.
A) for B) in C) to D) at
19. When she was criticized, she claimed that it was outside her ________ of responsibility.
A) field B) limit C) extent D) range
20. We welcome rain, but a(an) ________ large amount of rainfall will cause floods.
A) extensively B) extremely C) specially D) constantly
答案：16-20 CCBDB
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