—What do you think of the price of these computers?—They are at least equal in price to, if not cheaper than, ________ in other companies.
The air in big cities _____very dirty by factories.
The number of people invited _____fifty, but a number of them _____absent for different reasons.
All but one ____here just now.
Father went to his doctor for ____about his heart trouble.
_____turn green in spring.