在下列对话的每个空格中填上一个词，使对话完整、正确。

Ron: Hi, Sam. I'm going to the 1.            office to send a postcard to my friend in China.

Sam: Me too. I want to buy some stamps 2.            my father. Let's go together.

Ron: Well, are you 3.             tomorrow? My classmates and I 4.             go on Plumtree for an outing. Would

       you like to go 5.             us?

Sam: Really? That's a good 6.            . I'd love to. What 7.             shall we start?

Ron: Let's 8.             it 6:30 in the morning.

Sam: By the 9.            , where shall we 10.             them?

Ron: At the school gate, shall we?

Sam: That's OK! See you tomorrow.

Ron: Goodbye!