根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    On Mother's Day, after my children arrived home from school, the doorbell 1 . I went to answer it, and there stood two clean-faced, tall, smiling2 . They held two of the most beautiful flowers I had ever seen. They said to me, “Do you 3 us? You often fed us cookies! They were so 4 . We wanted to come back and thank you and say “Happy Mother's Day” because you were like a mom to us!” I couldn't help crying, and thanked them.

    I remembered the old days. At that time I did not have a lot of money or a big house and l was a single mom with three young  5 of my own. The two boys were a bit older than my children. They always visited my yard, but they 6 cared about the fact that their faces were dirty. Every day they enjoyed themselves with my 7 girls and one small boy.

    I spent a lot of time 8 healthy cookies. The two boys played happily in my yard, and they were quite happy to share food, books, games and then, for a time, they didn't  9 us. I wanted to know what happened in their lives, and hoped for the best.

    But now they came back and thanked me. This is the 10 gift I have ever received from two young boys.