If you _____ smoke, please go outside.

---Shall we meet at the station at 7 am?---In fact, we _______. The train _______ until 9 a. m.

—Is Nick coming by train?—He should, but he ________ not. He likes driving his car.

So many people violate traffic regulations that we ____ put too much emphasis on the importance of traffic safety. 

You __ drive your car so fast. It's very dangerous.