Could I look at your picture?   --Yes, of course you ______.

—Must I learn all these words by heart? —No, you ______. It’ll be fine if you copy them in your exercise books. 

— There is somebody at the door. ________ it be Tom?— No, it _______ be him. It’s just six o’clock. It’s too early.

(2014·郑州一检)—Who is late for class again?—________you ask？Tim，of course.

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