—Why didn’t you finish the task?—I didn’t think it is ________ the effort.
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.