I am always eager to do experiments, especially chemistry ones. It's   _26_  to work with test tubes and beakers（烧杯） , even though sometimes my efforts end in__27___. Experiments were fun for me  __28  a recent accident.

The   29  happened when I was heating a big test tube with an alcohol burner（酒精灯） , chatting to my partner while waiting for__30____ changes. All of a sudden, the tube cracked. Even though I jumped from my seat when I heard the crack, the hair on my forehead was __31____ as I was leaning too close to the test tube.

  __32___ I had no time to be sad about my hair: the liquid in the test tube poured onto the table and caught fire. I'd never  33 _ anything so bad! My___34___went blank （空白）for a moment. Then I quickly covered the fire with a damp cloth to__35____.

The teacher told me that the test tube broke in half at the bottom because we didn't dry it properly before __36___ it.

We calmed down and did the experiment, again. But our hearts were still __37____ rapidly even after we walked out of the lab.

But my bad __38___ didn't end there! Since all __39     was focused on the flames while we were in the lab, I didn't see the liquid falling onto my trousers.

During the following class, I felt a __40___ in my leg. Soon it became more and more painful and I touched the area with my fingers,   _41_  to make things better. But to my great    42___ , the material of my trousers turned into powder! “Vitrio（硫酸）! ! !”The terrible word came into my mind. I rushed out right away to wash and examine my poor skin.  _43_  , it was not a serious injury.

After changing my __44____I sat down and told myself: danger is no joke! It's very important to have a serious___45___ in chemistry class. Doing scientific experiments as a learner is no laughing matter.