At the meeting they discussed three different     to solving the problem.

My mother is the type of woman who suspects that a late night call or a surprise invitation is a ________ of bad news.

The boy slipped out of the room and headed for the swimming pool without his parents' _____.

After all the harm she has done,she __________ whatever she gets.

As is well－known，the brain performs a very important ________，which controls the nerve system of the body.