My mother ________ as an architect since she graduated from Tongji University.
| A．worked | B．has worked |
| C．had worked | D．is working |
There are some students _____ on the playground.
A. run B. running C. to run
Sam _____ walks to school. He always goes to school by bike.
A. sometimes B. often C. never
—Excuse me, _____ I borrow this book?
—Of course.
A. will B. may C. must
Judy, don’t put your keys here. _____, please.
A. Put them away B. Put away them C. Put it away
The teacher often says, “ _____ late for school.”
A. Don’t B. Don’t be C. Not be