—How often do you exercise? — .
You ___________ finish the report today. Any time before this weekend is OK.
—Who is that little boy in the photo?—It’s me. It ___________ when I was five.
—I’ve got a ticket to the ball game tonight.—Oh. How ___________ you __________ it?
—When will the second class begin?—________ two minutes.
I’m very proud of that Beijing is one of __________ cities in the world.