The following tells us how to reuse the used water. Which is the right order of the passage?

The best title for the passage is “_______”.

你叫李平，是英语系学生会主席。写一封信给王教授，请他做一个有关中国历史的报告。注意信中要包括目的、时间、日期和地点。

The would “it” in the last sentence refers to _______.

The following tells us how to reuse the used water. Which is the right order of the passage?

There wouldnt be enough water for us if we didnt _________.

The best title for the passage would be _______.

根据以下内容回答下列各题,

The water we drink and use is running short in the world． We all have to learn how to stop wasting our limited water. One of the steps we should take is to find ways of reusing it. Experiments have already been done in this field．

Today in most large cities, fresh water is used only once, then it runs into waste system. But it is possible to pipe the used water to a purifying factory. There it can be filtered and treated with chemicals so that it can be used again, just as it were fresh from a spring.

But even if every large city purified and reused its water, we still would not have enough. Then we could turn to the oceans. All wed have to do to make use of the seawater on earth is to get rid of the salt. This process is called desalinization, and it is already in use in many parts of the world．

The way to stop wasting our limited water is to ________.

In recent years, computers are being made _______.

Home computers can be used for _______.

Salesmen use computers mainly to _______.