This innovative refrigerator requires no electricity. This will be extremely __________ to people in hot countries like Nigeria.
benefitial
This tough drum (cylindrical container) is an easy and ____________ way to transport water---essential in poor places where people don't have running water at home.
affordable
This hearing aid (sound amplifier), which you put on your ear, is operated by solar power. It's designed for ___________ use and it's so unique and user-friendly.
personal
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