“ Is this your schoolbag ” “ No, it isn’t. It’s________.”

I did my homework very ______,so my father looked ______.

millions of calculations involved,had they been done by hand, _____ all practical value by the time they werefinished.

The unquestioned role of students is to learn as much as possible through ________ method they find.

You should try to get a good night’s sleep _______much work you have to do.