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内容包括：
1）感谢他们的照顾；
2）虽然遭遇了文化冲击，但在他们的帮助下，适应了美国的生活；
3）在美国学习、生活期间学到了很多东西；
4）回国后很想念他们，希望以后经常联系，也欢迎他们来中国玩。
Dear Mr. and Mrs. Brown,
How are you？
He spoke in a loud enough voice everybody hear him.
is here, let's begin.
Don't forget off the lights you leave the room.
She kept silent I .
she was often late for school, the teacher very angry.
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