The moment John will never forget is ______ Mr. Smith gave him a lot of valuable advice on how to improve his writing.
我们到达时,比赛正在进行。When we arrived, the match was __________ __________.
在这个教室里并非每个学生都是来自中国。__________ __________ student in this classroom is from China.
短裙现已过时,长裙又流行起来了。Short skirts are definitely on the way __________ now and longer ones are up to __________ again.
首先,这已经不是个新问题。__________ __________ start, the problem is not new.
过马路时要注意车辆。When crossing the street, look __________ __________ cars.