21. 【解析】选A。考查动词短语。句意：我们本没那样计划我们的展览，但结果很好。work out锻炼；计算出；结果; try out实验; go out出去；熄灭; carry out执行，实施。
独具【举一反三】A survey _______ after six months suggested the new measures did work.
A. worked out B. tried out
C. went out D. carried out
【解析】选D。考查动词短语。句意：六个月之后进行的调查表明新的措施的确奏效。carry out执行，实施，符合语境。
