17.
M: I would like to move to the suburbs, but I don't have enough money to pay the high taxes.
W: I wish you could. It's nice to live there.
Q: Why isn't the man moving to the suburbs?
正确答案：C
解析：男士说：“我想搬到郊区住，可是没有足够的钱支付高额税款。”可见C正确。

18.
W: Son, I don't know what to get for your father. He has about everything, doesn't he?
M: Why don't you get him an MP3 player?
Q: What's the woman's problem?
正确答案：C
解析：女士说，“我不知道该给你父亲买什么礼物”，故C正确。