The windows of classroom _____ up every week.
| A．is cleaned | B．was cleaned |
| C．were cleaned | D．are cleaned |
--- Has your uncle ever been to Tibet ?
---___________________________.
A. No, he didn't B. No, he haven't C. No, never
Hurry up, ______ you'll be late for school.
A. but B. and C. or
—Does she like singing English songs?
—Yes. She _______ to sing English songs in her room.
A．often does B．is often heard C．often hears
I like ______. They are healthy food.
A. tomato B. fish C. tomatoes
The man makes a living _______ teaching.
A．without B．with C．by