--- Will you take up teaching as a career after graduation? --- Hard to say. I _______ go abroad for higher education instead.

—Can I pay the bill by check? —Sorry, sir．But it is the management rules of our hotel that payment ____ be made in cash．

The boy is old enough to ---------himself.

Don’t put off today’s work for tomorrow. I mean, today’s work______ today.

    --- Whose backpack is this?--- It        be Mary’s. She is looking for hers.