题目

完形填空What comes to yourmind when you talk about donations? You probably think of a group of people with1in hand asking people to donate money. Butmy school came up with a2way of raising funds—Fun Night. Fun Night is like aparty. Students pay money to get in and have dinner at school. The3they pay will go towards helping poor children4. Two months ago, I tookpart in Fun Night. There were all kinds of 5 in Fun Night. The mostpopular game was the jousting ring (夺环). Ijousted with several of my6and managed to knockplenty of them off the ring. 7, they developed different strategies tow定理“等腰梯形的对角线相等”的逆定理是________