情景交际：根据上下文补全对话。

Clerk: Can I 1______ you?

Ben: Yes, 2______. I 3______ some clothes. Do you have black pants with the latest styles?

Clerk: Yes, we do. We 4______ black pants, red pants and blue pants. 5______ you like them?

Ben: Yes, I do. How much are they?

Clerk: They are thirty-eight 6______.

Ben: Do you have 7______?

Clerk: Yes, we do. The 8______ shorts are sixteen dollars.

Ben: But I don't like green. How about those blue shorts on the table? How much are they?

Clerk: Eighteen dollars. And those black ones are twenty dollars.

Ben: I'll 9______ the blue ones.

Clerk: OK. Here you are.

Ben: Thank you.

Clerk: You are 10______ .