writing the article, Mrs. Curie even forgot her dinner.
What if we meet with a situation _______ none of us are able to deal with?
His lack of professional knowledge _______for the failure of the experiment.
Tom was about to close the window his attention was caught by a bird.
—Do you have any idea why Mark is leaving?—No. In fact,everyone is _________about it.
—Mary looks down today. What is up?—Well,________happened between Mary and me is none of your business.