Tom the TV set for $500，which was much cheaper than he had expectedA. bought B. paid C.

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(答案→)A. bought
B. paid
C. cost
D. spent
解析：汤姆花了500美元买了一个电视机，这比他预料的更便宜。Buy+某物+for+钱数；pay+钱数+for+某物；某物+cost+钱数；某人+spend+钱数 +on某物。故选A。