1.21You can’t get across the river （） by swimming.

1.21They complained that you charged () prices for your services.

1.20If you ()in taking this attitude, we’ll have to ask you to leave.

1.19What () of the population in a modern technological society are, like myself, in the fortunate position of being workers?

1.18They are trying to design generations that will produce high-pressure steam as () as possible.

1.17() what anyone does is beneficial to the society.

1.161It’s ()【legal】for people under 17 to drive a car in ritain.

1.15The rescue workers searched every room of the house trying to find any survivors but ().

1.141In the new factory all the equipment was ().

1.13We must ()that the telegram arrives in time.

1.12We tried and tried, but it was all ().