She is upset today, and I want to do I can to cheer her up.

Now the train service is very good. The trains are ________ on time.

We must keep our room clean. Dirt and disease go , you know.

All schools in our province　______　new English textbooks to improve students’ listening，speaking，reading and writing abilities three years ago.

对下列相关词语的解说，不正确的一项是