I don’t know _____ he will come or not tomorrow.

_______ is no possibility________ the engineer cancomplete the project within two weeks

Is Lucy knocking at the door–No. It ________ be Lucy. She is in Japan now.

Did you hear the news about the fire in our building—Yes. It took the firemen two hours to_______ the fire.

The careless driver knocked down the old man _________ was crossing the road.