The gym is a public place, so you should be and leave all the machines clean after using them.
A. considerate
B. cautious
C. subtle
D. modest
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(答案→)A. considerate
B. cautious
C. subtle
D. modest
解析:A. considerate考虑周到的,B. cautious小心谨慎的,C. subtle微妙的,敏感的,狡猾的,巧妙的,D. modest谦虚的,谦逊的,适度的,适中的,端庄的,羞怯的,句意:体育馆是公共的地方,所以你应该考虑周到,用完后,将所有的机器弄干净。所以选A。