Whenever the teacher was not here,the children       make a lot of noise.

.I tried to call on you last week but your dog simply ____ not let me come through the gate.

We _______ finish it ahead of time, though it was such a tough task.

It’s high time that we students________ harder as the examination is drawing nearer.

No student _________ go out of the school campus after ten o’clock at night without permission, according to the school regulations.