Half a month passed and the boy all his money, so he had to turn to his friends for help.

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(答案→)A. ran out
B. ran out of
C. ran across
D. ran away with
解析：考查固定词组，ran away with意思“跑了”，ran across意思“跑过”，ran out of意思“跑出来的”，ran out意思“用完”，句子意思“半个月过去了男孩花完了他的所有钱，因此他不得不向他的朋友求助”