介词+关系代词
1.There are fifty students in our class,all____are working hard.
2.I will remember the day forever ____I won the first place in the contest.
3.The computer ______I paid 5000 yuan is made in Shenzhen.
4.he handed me a pen,_____I wrote down my address for him.
5.The man _____you talked just now is our manager.
6.This is a subject______we might argue for a long time.