阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式（不多于3个单词）。
What do people do with their old, out of date but still useful computers? Most people don’t know       to do with them. Many old computers are put away in homes. Many more       (throw) away as rubbish.
Finally, some companies are thinking of ways    (bring) down the number of old computers. Sony has agreed to help recycle old Sony products. Dell, Hewlett Packard and other      (company) now also take back some old computers.
In some countries, laws have been passed, too. Computer companies have to pay for collecting and       (recycle) their used products. And 70% of computer waste must be recycled. The idea behind the laws      (be) that computer companies themselves should pay for the cost. That will encourage them to make computers      (easy) to repair and upgrade (升级).
Yet while many people are throwing away good computers, others cannot afford      at all. Hundreds of organizations are working to solve this problem. They collect and repair old computers. Some also teach others how to repair computers.       computers then go to schools, charities (慈善团体) and people who need them. Giving a used computer to one of these organizations can turn one person’s rubbish      someone else's useful things and cut down waste, too.