阅读下面短文, 掌握大意, 从A、B、C、D四个选项中选出最佳选项。 One night in July at an all-girls summer camp, the students sat around a fire and talked with each other. Their teacher asked if any of the girls wanted to1 something. It could be anything that happened that day and what they 2 it. One girl put up her hand. She said that another girl said something bad to her and it hurt her 3 . For that, she felt quite sad about it. The teacher went into the4 , and carried a tube of toothpaste(牙膏) when she walked out 5 the door. Then she held the tube 6 in the air so that every student could see7 . She squeezed(挤) a bit so some toothpaste came out. She then tried to put the toothpaste back in the tube, 8 she couldn't make it. It just made a mess(脏乱). She squeezed the tube even more, 9 more toothpaste and making even more of a mess. 10 of the toothpaste would go back into the tube.
11 , the teacher then told the students, "This toothpaste is just like the12 you say. When you say something bad, it's13 to take it back. It only makes a mess. 14 before you speak and make sure something you say are15 before you let them out. We should always be careful with what we say. "
Remember: something you say can be a soothing medicine or a sharp knife.