题目

Yesterday I read a report in a newspaper.It was about a charity show.The aim of the show was to raise money for the ______ children.In the country areas，some children can't go to school ______ their parents don't have enough money to pay for their education.Many pop stars also took part in the show，such as Andy Lau，Jay，Faye Wang and Kelly Chen.They didn't ask for any pay(回报)．They did it for ______！There were a lot of performances ______ singing and dancing.The audience(观众) were so excited ______ they clapped their hands from time to time(时常)．Of course，the show was a（2008•菏泽）在梯形ABCD中，AB∥CD，∠A=90°，AB=2，BC=3，CD=1，E是AD中点．求证：CE⊥BE．