I wonder what you mean __________ saying that?
A. for B.by C.with D. to
“Remember not ______ your homework at home again,” said the teacher.
A. leave B. to leave C. forget D. to forget
Our Earth will be ________ if we go on cutting down millions of trees every year.
A. in great dangerB. danger C. dangerously D. out of danger
Trees provide food and shelter and make us ______ comfortable.
A. feeling B. feel C. feels D. felt
Trees make our city more beautiful and ________ noisy, do you think so?
A. much B. little C. less D. fewer
Three trees can do the job of 15air-conditioners _________ almost all day.
A. run B. are running C. ran D.running
