Helen is 15 years old, and Joan is 15, too. So Helen is________Joan.

It is necessary for children to exchange ideas with parents from time to time so that the generation gap between parents and children can be _____.

Why do you want a new job ____ you’ve got such a good one already?

I’m afraid I’ve failed the driving test.— ______. Maybe things are not so bad as you think.

Scientists are working hard to make possible for people to live on Mars in the future.