--- I don’t think I should stay in this house?--- ______ why?
I hate people ______ talk much but do little.
—Could we go and watch the football game? —No, ______ you have the tickets.
—Can I go to the park, Mum?—Certainly. But you ______ be back by six o’clock.
—I’m leaving now.—______ you turn off the lights and the computer.
The population problem may be ______ one of the world today.