11.  You need to waste more time finding ways to live harmony with so many roommates.

12.  You need to get out your sleeping room to go to the toilet at dark night.

13.  However, you don't need to worry all of these above if you live in other dormitory with a room, a washroom and four students.

14.  If she was from the Department of History, she needed not to learn mathematics at all.

15.  The science departments boys maybe eager for pretty girls to fulfill their boring lives, maybe they need to learn something written in words not figures or letters, maybe they just want to use their right brains.

16.  "Here are all the materials you'll need to finish the registration this afternoon.

17.  Then I'll need to go to different classrooms get registered.

18.  So what we need is to get out of the old idea and observe the outside world in a new way.

19.  She is just a plain girl in our classroom and may or may not be needed.

20.  We need to be more cautious when making decisions and do not always follow others.