---Miss Lee, I didn’t catch what you said. Could you tell me ______ again? ---OK.
You must work harder, ____________ you will fall behind others.
— When shall I hand in my report? — As soon as it ____________ tomorrow.
Some students don’t know how to ____________ stress and become worried.
They had much difficulty ____________ the problem and they needed our help.
You’d better go to bed early. Don’t ____________ too late.