最佳答案:

　　12345CCCCB

最佳答案:

　　12345BCBCC

最佳答案:

　　1234ABCB5678CCDC9101112DBDA

最佳答案:

　　A.

　　1234CAACB.

　　56789EACBD

最佳答案:

　　One possible version：

　　Dear Frank,

　　Thanks for your letter.I can understand you. But I don't think you are right. In fact, it's a good idea to stop eating junk food like hamburgers or drinking Coke. You'd better eat more fruit and vegetables. You should drink water instead of Coke. I think you can also make a plan for keeping fit and ask your parents' advice. They will agree with you if your plan is good enough.Don't ask for money from your grandparents. If you don't give up the bad eating habit,you will feel even worse. Hope things work out.

　　Yours,

　　Lily