【范文欣赏】 　请进行完形填空(每空一词) One drop of water easily disappears，while the sea will never dry up；billions of drops form a river，and all rivers run into the sea. 1. One tree cannot stop the fierce sand storm or conserve water and soil，but the forest is composed of millions of trees,2. which can give creatures a home. One person's ability is limited,3. but human society has endless wisdom. And the masses have great creative power.4. In a word，unity is strength.