There is an empty __________(座位) on the bus.
My mother wanted me to __________(重复)my words.
Students shouldn’t ___________(冲) around in the classroom.
We should learn how to p__________ our environment.
I read an a________ about papermaking in the newspaper yesterday.
I have some _________(麻烦)studying English .Could you help me?
The doctors are able to_______(keep someone safe from danger) the little boy.
Don’t__________(触摸)the wall.We just painted it.
We can get all kinds of i____________ from the Internet.
Thank you for r__________ so much money for the poor children.