—You can switch off some lights.

— Oh, I have to prepare for it.

— She is so nice.

—              . Our teacher doesn't ask us to.

—You               be joking! Don't you know I'm afraid of water?

—It                be our teacher. She has gone to Beijing.

—Yes, you             .

    Electricity is very useful in our daily lives. It is said to be one of the greatest1 in human history. It lights our world, 2 our homes, cooks our food and gives us lots of happiness. Electricity brings brightness. Today, almost everyone around the world uses electricity in one way or another. It is 3 to imagine our life without it. When the power is off, schools, offices, shops and factories cannot 4 at all. Without electricity, our5 would be very difficult. In large cities, electricity lights the streets and buildings. It warms people and 6. People can heat food in microwaves. Electricity also cools our food in7. Electricity drives underground trains, works traffic lights and lifts the machines in factories. Radios, televisions and computers use electricity to bring entertainment（娱乐）and news to millions of 8 every day. In the countryside, electricity also helps a lot. In villages and on farms, electrical machines milk the cows. They also cool the milk and keep it 9for us to drink. In fact, electricity is used as much in villages as it is used in 10.

    Radios, telephones and televisions are widely used in the world. When you switch on the radio, you can listen. But when you use the telephone, not only can you listen to others, but also you can chat with them. However, you cannot see anything at all. Television is much better than both of them. People can watch TV and listen to it, but they cannot take part in what they see.

    Today, some people are using a new type of telephone called vision phone. With it two people who are talking can see each other. Vision phones can be of great use when you have something to show the person whom you are calling. It may also have other uses in the future. Some day you may be able to call up a library and ask to read a book right over your vision phone. You may be able to do the shopping through it too. Perhaps in the near future, vision phones will come into our everyday life.

    Jane's mother was about seventy, so Jane and her husband wanted to give the old lady a nice present for her      (birth). She liked drinking tea, so Jane bought a small       (electricity) machine for her. It could make tea and then wake people up in the morning.

    She brought it to       (she)mother on her birthday, and showed her how       (use)it. "Before you       (go)to bed, put tea and water in it, "she explained to her mother, "and       (not)forget to turn       the electricity. When you wake        in the morning, your tea will be ready. "After a few days, the old lady      (telephone)her daughter and said, "Jane, there is one thing I don't understand. Why do I have to make tea before going to bed? Can't I have tea in the afternoon      in the evening?"

                    ，she came back.

You                           three times a day.

Don't worry. I                    my clothes before leaving.

Is the baby                    ?

             that you come here before five.