题目

完形填空。Ms Brown is our English teacher. She is from England. She began to teach 1__ last year. But now she is leaving for her country. We are so 2__ to see her off because she is a good teacher. We're going to have a 3__ for her. We think it is the best way to say “Thank you and goodbye.”We 4__ to have the party this Saturday. Now, we are preparing for it. Wang Lei and Wei Wei 5__ all the teachers. Our Chinese teacher Miss Zhang 6__ come. Her family is going to take a trip to Beijing this weekend. 7__， the other teachers promised that they would come. Li Ye is writing a thank­yo如图，已知△ABC中，∠ABC=45°，F是高AD和BE的交点，CD=4，则线段DF的长度为(    ) A．    B．4    C．   D．