Having dinner together matters to the family., Breathing deeply can help., The common things did not occur to us., Collecting old stamps doesn't cost a lot., Some young man jumped into the market., A lot of people in the city go to the store., A few students in your class might disagree with you., Buying water costs a lot., A lot of people buy a bottle of water., This is because drinking clean water matters to many people., Buying water was a crazy idea at first., But it is a common thing now., Similary, the era(지역) of buying fresh air will come., Some people in small towns might disagree., They might say "Who would buy air?", But others in big cities might agree because it's getting hard to breathe., Actually, a few companies in China jumped into this business., They collect fresh air from hills and valleys., You might think the sales of the air bottles will not occur., But these fresh air bottles are selling in some cities in China now.,

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