These broken pieces of plates don’t fit together, they ___________ parts of different ones.

Humans can’t live _______ air.—I agree with you.[ ]

_______,parents should spend as much time as they can________with their children,thus they can influence them on the value of life.

You’re late! You were ____to be here an hour ago.— Sorry, Mr. Hu.

We have worked out a plan. But I’m not sure whether it will do in .