which,best,so,biology,geography,history,date,meeting,o'clock,ok,gate,so,show,around,show sb around,front,in front of,building,ground,ground floor,bright,modern,hall,diary,look at,wall,let me see,after class ,pardon,phone,on the phone,from...to...,take,get up,go to school,a.m,p.m,readingroom,only,sure,kind,all kinds of,borrow,borrow...fron...,letter,few,a few,away,far away from,on foot,best,all the best 这是U3的