Visitors ________ not to touch the exhibits.

 Don’t call him at this time tomorrow, because he ________ a meeting with his teachers.

Obviously the only way to make people realize that an action is morally wrong is to punish them if they ________ it.

—How did it come that you damaged your car so badly? —I ____into a tree on the roadside the other day.

As it was the rush hour, I was soon         in the traffic jam．