—Listen! There is a knock on the door．Who _____ it be?—It must be Jack．Just now I sent for him．

You________ the work better, but you didn’t put more efforts to it.

 My Ipod is not here. Where ______ I have put it?

If he had spent more time practicing speaking English before, he _____ able to speak it much better now.

__________ fired, your health care and other benefits will not be immediately cut off.