将下列句子排列成一个完整的对话。

( )A. Yes, just only a little.

(     )B. May I ask your name?

(     )C. Do you often go to the English corner?

(     )D. Sure. My name is Wang Ming.

(     )E. Do you have any friends here?

(     )F. Where is he from?

(     )G. Can he speak Chinese?

(     )H. He is from America.

(     )I. Yes, Bill is my good friend.

(     )J. Yes, I do.

二尖瓣关闭不全的外科手术方法有___________和___________。