根据语境，从方框中选择恰当的单词填空，并将正确答案填在短文后的横线上。

    Helen is my good friend. She taught English when I attended a training course two years ago. Helen was always ready for the lessons, and she  her best to make her classes lively. I used to be poor in English, especially in written English. But now I'm able to write letters and reports in English. I still remember she helped me with my English patiently. Teachers' Day is coming. I'm going to send her a card and give her my best .