What do you want to be in the future， Jack—I want to be university professor(教授). It is interesting job.

By _____ these old students, we hope ____ them good at looking after the younger students.

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

The boss left Jack ____the company when he was in hospital.

When you’ve finished with that book, don’t forget to put it back on the shelf, _______