Don’t your homework at home, or the teacher may be angry with you.

People cut down too many trees, _____ the greenhouseeffect becomes more and more serious.

下列各句中，加线的成语使用恰当的一项是( )

You can call me _______ 876-9889.—Thank you.

_______ the little girl was hit by a truck, nobody gave a hand to the girl ______ an old lady appeared. Why were they so cold-hearted