21.The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
The great use of school education is not so much to teach you things ____ to teach you the art of learning.
Modern science and technology has _____ communication between people far apart.
It _____ quite a few years _____ the accused was declared innocent and set free.
I'm not ____ my best tonight. I'd better not have anything for supper. Perhaps you'd_____me some tea.
The ____ is that the new machine will arrive tomorrow.