补全对话。 — Hi. You look excited. 1_____ — It is sth said that a singing contest will be held in our school soon. And I think it a good chance to exercise my singing talents. — 2_____ — A pocket radio will be given as a reward to the first prize winner. — Are you going to take part in it? — Sure. 3_____ — Really? But I don't think you've practiced enough. — I'm going to. I bet(打赌) I can get the first prize. — 4_____ I think you need to have a music teacher help you. — I don't think it necessary. 5_____ A. By the way,are they giving prizes? B. people say I have a good voice. C. I don't know what others say about it. D. You can do a lot better next time. E. It'll turn out fine If I practice a lot. F. What's happening? G. Don't be so sure.