It is well known to us all that in China pigeons stand for peace. However, in India the wheel in its national flag is also a _______of peace.
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 ______.