英语翻译问题，急~~~~~~~~~~~~~

1.离开房间之前，将灯关掉
Turn off the light before you leave the room
2.昨天，市场上最好的游戏被卖完了
The best game have been sold out yesterday
3.我们应该阻止学生进入网吧玩电脑游戏
We ought to prevent the student to go to the net-bar and play computer games
4.请告诉我这把锁是用什么制成的
Please tell me what is be made into this lock
5.在这个旅行者的梦中，他扮演一个非常重要的一个角色
He is act as a very Important role in the dream of the travelers

翻译部分1.Please turn off the lights before leaving the room.
2.Yesterday the best game in the market was sold out.
3.We must stop sudents from entering into the computer bar to play games.
4.Please tell me what the lock is made up of.
5.In the dream of this traveller, he plays a very important role.