Some students in this school abroad as exchange students every year. A.sent B.send C.are sent
—_____ you _____ your homework yet? —Yes, I _____ it ten minutes ago.
It’s necessary for you _____ exercise every day.
—Could you tell me _____? —Sorry, I don’t know.
The supermarket provides customers _____ plastic bags for free.
—Is it interesting to play computer games? —Yes, _____ you are interested in playing computer games, you’ll have trouble giving it up.