Trees         in winter but in spring.

Those people without children ________good care of by the government there.

Our classroom _____ every day, so it’s very clean.
A. cleans         B. is cleaned     C is cleaning.    D. cleaned

The world has a big headache and it _______ by money. It began in America last year.

In order to make Chongqing more beautiful, lots of trees _____ on both sides of the street.

The river smells terrible. People_______ dirty things into it .

when you want to talk to your teacher ,you should _    _first.

The windows must _________ before you leave the room.

— How clean and tidy your bedroom is!
—Thank you. It          every day.
A. cleans   B. is cleaned     C. was cleaned

An official ___________ by some reporters on food problems in Shanghai yesterday.