China has been pushing the reform of public hospitals ____ all its citizens.
—The poor people lived near the highway.—_____ very noisy.
As is natural, a man as old as he ______ be very forgetful.
You _____ pay too much attention to your reading skill, as it is so important.
I _____ have written to him because he phoned me shortly afterwards.
Sir, you ______ be sitting in this waiting room. It is for women and children only.