The city has improved a lot _________ I came here a few years ago.A. for B. since C. before
Physics _________much easier for me since Mrs. Yang began to teach us.
After a 3-week winter vacation, students usually _________ some weight when they return to school.
The more careful you are, ________mistakes you’ll make.
---________does she study English?---________ working with a group.
— I haven’t got a partner _________.— Maybe you can ask John for help.