题目内容

In the rich North, toilets using water are the largest single__________ on domestic water supplies.

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It is not a must for the developing countries that currently lack adequate capital to __________ this wasteful practice.

They need toilets which can safely turn human waste into a smellless, soil-like ________.

However, almost 60 percent of the water is lost during the ________.

Much greater use could also be made of recycled ________.