M: Mr. Smith, what do you think of our assignments?
W: You have done some very good work. I hope you can keep it up.
What is the probable relationship between the two speakers?（）

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W：The house is worth $81,500 in all, isn’t it?M: Yes, you can buy this house by paying 10% down and the rest over 25 years at interest.How much does the woman have to pay immediately for the house?（）

A．$81,500.
B．$8,150.
C．$815.
D．$1,000.

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