I can’t go to the cinema with you because I _______ stay here until my mother comes back.
Tim has some ___________ every day. He thinks it is healthy food.
—___________ is the sofa? —It’s $200.
Ed likes baseball, ___________ he doesn't like tennis.
—Do you have a tennis ball? —____________. Let’s ask Jim for help.
—Do you like history? —Yes. I think it’s _________. I can know much from it.