根据所给词的适当形式、音标或语境的提示，完成短文。
Long long ago, people lived in a clean world. There were no modern ____ (machine). The air was fresh. However, life today has ____ (bring) many new problems. One of the ____ (big) is the environmental pollution. Noise pollution makes us hear more loudly and get ____ 'æŋɡri more easily. Light pollution is ____ (harm) to birds. Air pollution is the most serious ____ ( kaɪnd) of pollution. It is bad for all living things.
Now, in order to protect our world, we need to do some important things. For ____, we should use both sides of paper and reuse plastic bags. Everyone should care for ____ waɪld animals and plant more trees. Of course, easier said than done. ____ (action) speak louder than words. If everyone knows the ____ (important) of protecting the environment, the world will become more beautiful.
