1.What are you doing?
2.What do you think of it?/How do you like it?/How do you feel about it?
3.Yes,I have (made a plan)./Yes,/Of course.
4.What/How about(going to ) Wuxi?/Why not go to Wuxi?/Why don't you go to Wuxi?
5.You're welcome./Not at all./It's a pleasure./My pleasure./Don't mention it.
(答案不唯一)