根据短文理解，从A、B、C、D四个选项中选择最佳填空。

    Junjun wanted to buy a birthday present for his mother. But he 1 much money. He was not happy. He thought and thought. Then he had 2. He could make a 3 by himself. So he made a nice card. On the front, he 4 a beautiful picture of birds and flowers. And on the back he 5,“To my dear mother, I love you very much. Happy birthday!”

    6 his mother's birthday, Junjun gave her the present. After she saw the 7, tears（眼泪）fell down her face. “8 are you crying (哭)，Mom?”Junjun asked, “You don't like it, right?”“9.”She said, “I love it very much. I'm the happiest（最幸福的）  10 because I have a great son like you.”