Excuse me, but can I sit here— ________. The man who sat here says he will be back soon.

Keys _______ used for ______ the doors.

keep working hard as I have done,and ________ it will pay off. It has done so far and so I just have to do thesame.

78. — You _____ repay this debt this week according to the agreement. — Don’t worry. I _______ pay it off before the deadline.

actory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.