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169.
M: The book costs $13, but I've only got $7.
W: I've got $8, so I'll lend you the rest.
答案解析：
正确答案为A。根据The book costs $13, but I've only got $7.这本书要13美元，可是我只有7美元。可知，男子有7美元，因此A项正确。
170.
M: How much are these T-shirts? Are they also on sale?
W: Yes, they are usually $30 a piece, but they are on sale and you can get 30 percent off.
答案解析：
正确答案为A。根据they are usually $30 a piece, but they are on sale and you can get 30 percent off. T恤原价30美元一件，现在促销，有30%的折扣，即便宜9美元，因此T恤现在要21美元，因此A项正确。
