I find this Math problem very .believe students can work it out .
“Remember not ______ your homework at home again,” said the teacher.
Our Earth will be ________ if we go on cutting down millions of trees every year.
Trees provide food and shelter and make us ______ comfortable.
Trees make our city more beautiful and ________ noisy, do you think so?
Three trees can do the job of 15air-conditioners _________ almost all day.