[解析]
W:Hey,peter.I'm sorry.
M:Hi,diana.What's wrong?
W:We were going to hong kong this weekend,but I am afraid I can't go.
M:How come
W:I have a really big geography test?And I have to study for it.
M:We can go next week instead.
W:No.I don't want to ruin your weekend.You go ahead.And Please take the book I bought to my friend sally.
Tell her I have to study all weekend Because I can't afford to fail the test.
M:Okay,then i'll go with dan.But it's a pity you can't come.