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 (__小题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. (__小题2:__), I’d love to. When and where?
A: It’s on Sunday in the hospital. We’ll go together to (_小题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 (__小题4:_) World Expo(世博会) 2010 in Shanghai?
B: I will, if I’m (_小题5:_). But I’m afraid I have to study for the coming tests. It’s (_小题6:_) for us, you know.
A:OK. Hope you can go with me. See you.
小题1:been
小题2:Certainly / Sure / OK / Yes
小题3:cheer
小题4:visit / watch / see
小题5:free
小题6:important
题目分析：
小题1:根据I haven’t seen you for long.我很久没有见过你了，此处Where have you been？你去哪里了？故填been。
小题2:would like to do sth.想去做某事，句意：你想加入吗？根据I’d love to.我愿意去，故填Certainly / Sure / OK / Yes。
小题3:cheer up为……打起，为……加油，句意：让我们为有病的孩子们加油打气。故填cheer。
小题4:Are you going to watch World Expo 2010 in Shanghai?你将去看2010年上海世博会吗？故填visit / watch / see。
小题5:I will, if I’m free.if引导的条件状语从句用一般现在时，主句用一般将来时，句意：如果我闲着，我将去。故填 free。
小题6:根据I’m afraid I have to study for the coming tests. 我恐怕我必须为即将到来的考试复习，所以考试是重要的。故填important。