—I couldn’t get through to you at home last night. You must have gone out then, ________? — Yes, I went to the cinema.
It is likely that water is not ____ endless resource, nor ____ that can be made once more.
How long ______ teaching? Forty years.
An operation is usually performed by a ______.
He is the manager of the factory. He is ______ it.
The whole hall wants ______.