Don’t touch the ____ wire. It’s dangerous.

The failure of his plan made him _____ that he had made a great mistake in working out the plan.

—Do you have any idea why Mark is leaving?—No. In fact，everyone is _________about it. 

In the park , the number of the visitors is tightly ____ to avoid damaging the environment or putting stress on the animals.

 With the help of the firefighters, the people caught in the fire managed to escape to the safe place, ______.