31. It’s not easy for experts to ______ H1N1 flu in humans from regular human seasonal influenza.
—Did you look up the time of trains to Shanghai? —Yes,the early train is ________ to leave at 5:30 am.
—My uncle suggests I ________abroad. — I would rather you ________at home.
The government is ________ everyone to save water.
Having ________ exercise every day will do great good to your health.
—Does the young man standing there________ the company? —No.The company is________ his father.