A. It's too expensive to hire taxies.

B. He doesn't like the suburbs.

C. He can't afford the high taxes.

D. The rent is too high.

18.

A. She thinks her son has almost everything he wants.

B. She is not sure whether an MP3 player is a nice gift.

C. She finds it hard to find a proper gift for her husband.

D. She's afraid she can't afford anything the man's father wants.

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。