.Either of you can finsh the job,but what I’m interested in is who is_____.
In our class _____ of the students _____boys.
—_____ 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.