填写对话所缺的单词,每个只填一个单词.
A:What can I do ______you,Mike?
B:I ____to buy a birthday cake.
A:_____ you want a big one ______a small one?
B:I'd like a small_______.
A:What ____this one?
B:It's nice.How _____is it?
A:Twenty yuan and thirty fen.
B:I'll _____it .Here's the money.