Listen to the following talk and fill in the missing words.Save the Environment to Save OurselvesEarth’s animals are disappearing ___1__. Many ___2__ are becoming extinct. Every year, one-half ___3___ in the tropical rain forests ___4___. some disappear before ___5____. no one has time to study them __6___. Today, 740 different ___7___ either threatened or endangered. Anther 400 species are waiting __8__. However, ___9___ 400 species have __10____ while waiting.__11____ worries scientists and environmentalists. They want the environmental ___12___ to be made stronger. Otherwise, nature’s treasures are disappearing __13___. the cure for cancer or AIDS, ___14___, many be hiding in the rain forest. ___15___, many believe, we must save the environment to save ourselves.