请根据信件内容完成下列句子。

Dear Mary,

      Thanks a lot for your letter and the photos. I like them very much. Here are some of my photos. In

Photo 1, I am swimming in a swimming pool. In Photo 2, I am playing soccer on the playground in my

school. In Photo 3, you can see my family at home. We're having dinner. In the last (最后的) photo, I

am at home with my little sister Beth. She's watching TV and I'm doing my homework.

     Best wishes for you and your family. Please write to me soon. 

                                                                                                                                                Yours,

                                                                                                                                                 David 

1. This letter is from _________ to _________.

2. In the first photo, David is ________ in a swimming _________.

3. In the second (第二) photo, David is _________ _________.

4. David's family are ________ ________ in the third (第三) photo.

5. In the last photo, David's sister is _________ ________.