求线段CD的长。

    Mrs. Brown is  a ____(Canada) teacher in a middle school. She t____English. She often helps her students ____ their study. Also, some ____(foreigner)children can talk with her ____(practice) English online.

    Li Yan, a girl from China learns much____Mrs. Brown. She is ____(excite) these days because she won first p____ in the English competition last week. She ____(real)improved a lot. When Mrs. Brown knew this, she was ____pride) of her. She believes Li Yan can do better.