. In order to learn the of the family business, Bill took a job as messenger boy in one o

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(答案→)A. ins and outs
B. dos and don’ts
C. heads and tails
D. p’s and q’s
解析：ins and outs 意为“细节”，dos and don’ts 意为“注意事项”，heads or tails 为掷钱币打赌时用语，意为“你赌正面还是赌反面”，p’s and q’s主要用于 mind one’s p’s and q’s，意为“留意自己的言行”。结合句意，选A最合适。