You can’t believe how terrible the fire is __________ you see it with your own eyes.
In order to let more people pay attention to their plan, they _________ some signs on the wall.
—Look out! Don’t run the red light when crossing the road next time. —_______________.
To solve the traffic problem, more and more bridges ____________ across the river every year.
Be quick! Jim _______________ for us downstairs.
—How long have you __________ this book? —About thirteen days.