We’re so busy that no one in the office can_____ for any other work

Chinese is ___ a useful language _____ more and more foreigners want to learn it.

Have you finished writing your book —Yes. It _______ and _______ soon.

The professor________at 8 o’clock，but he has not shown up yet，which worries all of us.[ ]

Mr. Lee suggested that all of us go out to have a walk to refresh our mind ________ classes.