Nobody expected there so many changes in our life in the 1970s.

High way and air transport will have to compete with _____service for passangers nowadays

to her school from the town of Harlan, Ifollowed a road winding around the mountain

Battery-operated slippers are used ______ seeing inthe dark.

Can we get everything ready by the weekend?—It all depends on ______ we can get Mr. Green’s co-operation.