根据语境，选择要说的话，将其标号填入题前括号内。
1．当你在商场购物时，售货员会说：[ ]
A. What can I do for you?
B. Can you help me?
C. Could you give me a hand, please?
2．当你打电话，问对方是谁时，说：[ ]
A. Who's that, please?
B. Who are you?
C. Who are you looking for?
3．当你邀请别人参加你的生日聚会时，说：[ ]
A. When and where shall we meet?
B. Would you like to come to my birthday party?
C. When can I have my birthday party?
4．当你建议某人出去与你散步时说：[ ]
A. Why don't you come out for a walk with me？
B. Come and have dinner with me.
C. Walk after supper is good for your healthy.
5．当你发现Tom不舒服时，问： [ ]
A. What are you doing, Tom?
B. What do you do, Tom?
C. What's the matter with you, Tom?
