— Sorry, I don't know ____________.

—________ they looked so tired.

— Drive ahead, and you will see the sign_____ on your right.

— Oh, I see. We ________________ waste water.

                     it was! A serious accident happened on the Yangtze River.

                     for school again!

             . You can look for your bag in the        and        office.

　　Museums have changed. They are no   1    places where one “should” go but now they are places  2    .

At a science museum in Canada, you can feel your hair stand on end as harmless electricity 3 through your body. At the Children's Museum in New York, you can play an African drum. There are no “Do Not Touch” signs in some 4museums in the USA.

      More and more museum directors   5    that people learn best when they can become part of what they are   6   . In many science museums, the visitors are encouraged to touch, listen, operate and experiment so as to discover scientific rules for themselves.

The purpose is 7 to provide fun, but also to help people feel at home in the world of science. If people don't understand science, they 8 afraid of it, and if they are afraid of science, they will not make the best use of it.

One cause of all these changes is the increase in wealth and spare time.     9  cause is the growing number of young people in the population. Many of them are college students or college graduates. They see things in a new and different way. They want art that they can take part in. The same is true of science and history.

         The old museums have been changing and the government is encouraging the building of new, modern museums. In the United States and Canada, there are more than 6, 000 museums, almost twice as    10   as there were 25 years ago.

    The American Computer &. Robotics Museum was open to visitors in 1990 in Bozeman, Montana. At first it was planned to build in Princeton, New Jersey. The founders moved to Bozeman in 1988 and after looking at the area they decided to build the museum there. With Yellowstone National Park to the south and Glacier National Park to the northwest, the museum attracts thousands of visitors from all 50 states and over 50 countries. The American Computer &. Robotics Museum has been written about in many publications such as The New York Times, The New Yorker, Los Angeles Times, QST and USA Today.

    When visitors first enter the museum, they are shown a video introducing the museum and its collections. All visitors are given the chance to join in tours led by friendly tour guides. We have had visitors aged from3 to 93- it is a big family. Over 1,000 exhibitions are shown in the 6, 000-squaremetre museum. Travelling through our museum, you will see the exciting 20,000 years of history of the information age. Technology becomes easier to accept when one learns about its origins(起源) in the natural process(进程) of human development.