The teachers often tell their pupils _____    across the road when the traffic light is red. 

You should really         smoking because it’s bad for your health.

Susan usually ________ her homework at 7:00 in the evening.

— What’s wrong with you, sir? — My flight ______ ten minutes ago. What should I do?

 —Do you often get online?— Yes. I ______ lots of time on it. It’s a good way to kill time.