His lack of professional knowledge _______for the failure of the experiment.
I think the doctor is able to cure of___________is called.
Let us not waste____________ time we have left.
——Excuse me, ____________?——That's 110 yuan altogether, sir,
—Sorry, I couldn't find the magazine you asked for. — ____________.
————That was a green dinner. _______ ————Thanks. But it really only took an hour.