急急急，请哪位英语高手帮忙翻译一下下面的句子，汉译英,不要机器翻译的，帮忙翻译准确点，在线等，谢谢!

1.Vice-Chancellor and checked again to ensure there is no classroom of students to stay in the classroom. 2.In the mountain, team leader for us waist anchored the rope root. 3.Why do not you take part in this extreme sports? 4.It requires great courage