“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
_____ the right kind of training, these teenager soccer players may one day grow the international stars.
--- Can I help you, sir?---Yes, please. Do you have any books on cooking?---There are only a few,______.
Charles Babbage is generally considered ______ the first computer.
I can’t have you _____ to your mother like this!
After the heavy rain, the level of the lake rose ___ 1 meter ___ 8 meters.