根据短文内容，从A, B, C, D四个选项中选出一个能填入相应空格内的最佳答案。

Dear dad,

How's it going? I am living with my host family—the Browns in New York. Mr. Brown is a teacher. And he 1 math in a primary school. Look! That is Mrs. Brown. She is 2with her friend on the phone. She is very nice to me. They just have 3 children. One is their daughter, Maria. She's very cute, 4 she often cries(哭). The other is their 5, Mike. Now, he's washing the dishes. He's 6 eleven-year-old boy.

Today is Sunday, but I have to stay at home, because it's a 7 day. Look! Many people are wearing raincoats. They are walking very8. I can also see a boy running 9 the rain. 10 is the weather in Beijing now? Please write back to me soon.

Yours,

Mingming