题目内容：

根据对话情景，填入恰当的单词。（每空一词，每词1分，共6分）

A: Hi! May I speak to Sam, please? I have something for him.

B: Speaking, please. This is Sam.

A: Sam, I haven’t seen you for long. Where have you (__1.__)?

B: I am at home all the time because of my illness. What’s up?

A: It’s about volunteer work. Would you like to join us?

B. (__2.__), I’d love to. When and where?

A: It’s on Sunday in the hospital. We’ll go together to (_3._) up the sick kids.

B: Great. We can sing songs and read some funny stories for them. They must feel happy.

A: By the way, what are you doing on May Day? Are you going to (__4._) World Expo(世博会) 2010 in Shanghai?

B: I will, if I’m (_5._). But I’m afraid I have to study for the coming tests. It’s (_6._) for us, you know.

A:OK. Hope you can go with me. See you.