D. after
14. He had just finished his homework ______ his mother asked him to do some reading.
A. when B. while
C. after
D. since
15. The conference was held to discuss the effect that tourism has ______ the wildlife in the area.
A. in
B. on
C. at
D. with
16. Not knowing much of the world yet, simple-minded teenagers are easily ______.
A. taken up
B. taken in
C. taken on
D. taken off
17. To keep healthy, Professor Johnson ______ cycling as a regular form of exercise after he retired.
A. took up
B. caught up
C. carried out
D. made for
1. A
句意:与此同时,商业面临的问题是这样的研究是否值得这个花费。be worth + money/cost/work…表示“值得……”。
2. C
句意:我给我儿子买的这本书是值得花这些钱的,这本书很值得多次研读。worthwhile“值得(花时间/精力/金钱)的”,作定语。be well worth doing“很值得做”,主动形式表被动。
3. A
句意:双鸟在林不如一鸟在手。be worth+名词“值得……”。worthy作定语,意为“有价值的,值得尊敬的”;valuable“有价值的,贵重的”,priceless“无价的,贵重的;无法估价的”。
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