Last year, a new machine ____ by a young engineer named Daniel. CleanAir ____ by solar energy, and harmful gases ____ from the air through special filters. When the first model ____, many problems ____. After several improvements, the machine ____ to the public. Next year, thousands of CleanAir machines ____ in schools and hospitals. Environmental experts will monitor the system and more ____ from pollution The fork ____ today in almost every home and restaurant around the world. It ____ many centuries ago, but at first it ____ by everyone. When forks ____ to Europe from the Middle East, they were seen as strange tools. but over time, forks ____ to royal dinners, and new table manners ____. In the future, smart forks ____ to help people eat slower and healthier. It is expected that even more advanced dining tools ____ as technology improves.

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