最佳答案:

　　A. to be rude, made trouble, gentleman, politer, more responsible

　　B. shy, had few friends; outgoing, go to lots of parties； confident

最佳答案:

　　One possible. version：

　　Dear Miss Yang,

　　Thank you for teaching us so well. Nearly 3 years has passed, but' I can still remember the first day I met you.You greeted me with a big smile. With your help, I have changed a lot. I used to be afraid to speak in class. But now I'm brave enough to answer your questions. Every time I have trouble learning English, you would offer me help. Thanks to your help, I've improved my English a lot. What's more, you make me know how to get on well with my classmates.

　　You are one of my favorite teachers. I will remember you forever.

　　Yours,

　　Linda