If indeed silence is golden, it is also becoming as rare as gold. It seems that the progresses of man includes a rising volume of noise. 【M1】______ In every home a stereo or television will fill the rooms sound. 【M2】 ______ Between sunrise and sunset, streets and highways are a constant source of voice from cars, buses, and trucks. You can pass any factory or 【M3】 ______ construction area and the roar of their machinery will make your ears 【M4】 ______ ringing. Music is played in every supermarket, most restaurants, and 【M5】 ______ many offices. Big cities of the world are well-known by. their noisiness.【M6】______ Noise pollution is the new side effect of our technological age. Day or night, sound of the work fills the air. It seems 【M7】______ that the smoothing effects of silence are nowhere to be found. Even the quiet of our careful protected wilderness areas can 【M8】______ be invaded at any moment by a passed jet. 【M9】______ We are learning, finally, that silence is a natural resource and must be protected by law. It appears that we all find company in sound, if we all demand a little quiet from time to time. 【M10】______ 【M1】