When you go abroad for further study, you should learn to adapt to the of the destination country.
A. customs
B. habits
C. interests
D. instructions
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(答案→)A. customs
B. habits
C. interests
D. instructions
解析：考查名词：A. customs风俗，B. habits习惯，C. interests兴趣，D. instructions指示，句意：当你出国深造，你应该学会使用所到国家的风俗。选A。