There is _____ pollution in the world. We must stop it.
—________ is it from here to the supermarket? —About twenty minutes’ walk.
—____ can you finish this English exam? —In about one and a half hours.
—________ does it take you to walk to school? —About 20 minutes.
—Do you go there by bike ________ by bus? —By bike.
What do you ________ the workers in the factory?