Rubbish _______ light after this kind of new machine is invented.
Why not get some work experience first ______ go straight on to university?
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.