— The terrible accident is under investigation．— Actually, quicker action _____ those workers trapped in the mine．

—Thank you for reminding me of the time, or I ____ late yesterday． —Don’t mention it．

“Must we do it now?” “No, you _____.”

You _____ pay your library fines. If not, you _____ not be allowed to graduate.

Scientists suggested parents _______ children do the housework to make money.