----Will you be ________ this afternoon, Tom? ----It depends. I’m afraid I’ll be called in by my manager. 

My elder brother wants to buy a _ computer, so that he can carry it around when he travels.

I’m sure that if you make good use of your ____ time, your English will be improved in a short time.

Her __________ wealth is in fact a very small sum.

The air in mountain areas is ____ that in big cities.