Many people are ________ as to what to do when thereis a fire

There is_______ food here. We must go and buy some.

Let’s ask Michael. I think he can_______a good idea about how to deal with this problem.

As is _______ known, a good knowledge of basic physics helps us better understand natural phynomenons

He never __________ to help those in trouble because he was a kind－hearted man. [ ]