根据内容回答下列各题，The home computer industry has been growing rapidly in the United States for the last ten years. Computers used to be large, expensive machines that were very difficult to use. But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity has been increasing as more people have been buying computers for their homes and businesses.

Computers have been designed to store information and compute problems that are difficult for human beings to work out. Some have voices that speak with the operators. Stores use computers to keep records of their inventories (库存货物) and to send bills to their customers. Offices use computers to copy letters, record business and keep in touch with other offices. People have been using computers in their homes to keep track of the money they spend.

One important new use for computers is for entertainment. Many new games have been designed to be played on the computers. People of all ages have been playing these games. People also have been buying home computers to play computer games, watch movies and listen to concerts at home. They have become very popular indeed.

Computers used to _______.

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 _______.