Never _______ forget the days when ______ together with you. 

—Why were you late for the party?—I ______ in the heavy traffic.Otherwise I ______ earlier.

When I am tired with math exercises, I            go out for a walk to get relaxed.

eryone _______ not fire without the signal or you’ll be severely punished or even killed,” urged the commander.

He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.