下面是有关英语演讲比赛的消息，请据此用英语写一通知。（100词左右） We are going to have an English-speaking contest for senior students so as to improve our oral English. It will be held in auditorium on the 5th floor in the teaching building at 4:00pm. , June 9th. Those who want to take part in the contest are supposed to come to sign up at the office of the students’ Union before May 25th. All the senior students are welcome to join in the contest. The first five winners will be given prizes. Please try your best and get ready in time. Wish you success! The students’ Union