1.now more and more people go in for dangerous sports such as punge.
2.you had better leave at once ,or you will not be able to catch the trian.
3.the teacher has us finish clean the classroom before 5pm.
4.i haven't heard from my pen pal for a long time.
5.you'd better take a taxi in case of being late for the meeting.
6.in spite of heave snow,she goes to work as usual.
7.sometimes she practises yugo instead of logging.
8.it was your effort that you passed the exam.
9.i'm sorry to keep you waiting long.
10.he always keep his mother's taeaching in mind.
11.this is the dictionary they are looking for.
12.what were you doing when i called you last night、
13.be sure to turn off electricity before leaving the computer room.
14.she didn't go to work the day before yesterday because of sickness.
15.he prefer to stay at home rather than see that meaningless movie.