1    time I have been changed quite a lot from a     2    machine in 1642 to an analytical machine in 1800s. At first I could only     3    difficult sums but gradually I could be made to work as a “universal machine ” to solve any difficult    4     problems.

Both the Winter and the Summer Olympic Games are held on a regular    1    . The Winter Olympics are usually held two years before the Summer Games. Every country wants to host the Olympic Games because they thought it not only a     2     but also an honor to be chosen.

The Amber Room, made of several tons of amber and  decorated    1    gold and jewels, has a(n)     2     history. At first, it    3    for the palace of Frederick I. Then in 1716 he gave it to Peter the Great, and later, the Czar made it serve as a small    4    hall.

Part 1. I can well remember there was a time     1     a deep blue sky, the song of the birds, moonlight and flowers could never have kept me     2    . That’s changed since I came here. For example, one evening when it was so warm, I stayed awake     3     purpose until half past eleven in order to have a good look at the moon by myself. It was the first time in a year and a half that I     4     the night face to face.

Part 2. At first the English spoken in England between about AD 450 and 1150 was very different from     5     spoken today. It was based more on German than the English we speak at present. Then gradually between about AD 800 and 1150 English became     6     like German because those who ruled England spoke first Danish and later French.

Part 3. I am fond of my sister but she has one serious shortcoming. She can be very     7    . I know the proper way is always her way. My sister doesn’t care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a     8     look. When I told her the air would be hard     9    , she said it would be     10     interesting experience.

Yuan Longping,    1    is one of China's most famous scientists, considers himself as a farmer. Yuan Longping grows    2    is called super hybrid rice. In 1973, he became the first    3    (agriculture) pioneer in the world    4    (grow) rice that has a high output. This special strain of rice make    5    possible to produce 20% more of the crop in    6    same fields.

    7    (bear) in 1930, Yuan Longping graduated from Southwest Agricultural College in 1953. Since then he has devoted his life to     8    (find) ways to grow more rice. Thanks    9    his research, farmers are producing harvests' twice    10    large as before.

Water had also appeared on other planets like Mars but    1    the earth, it had disappeared later. It was not immediately obvious that water was to be    2    to the development of life.

That afternoon aboard the train, the cousins    3    in their seats. Earlier that day, when they crossed the Rocky Mountains, they managed to    4    some mountain goats and even a grizzly bear and an eagle.

For forty years Jane Good all has been    5    about making the rest of the world understand and respect the life of these animals. She has argued that wild animals should be left in the wild and not used for    6    or advertisements.

Dr Yuan is quite    7    his life! However, he doesn't care about being famous. He feels it gives him less    8    to do his research. He would much rather keep time for his hobbies.

Then he    9    the lace of the shoe and eats it as if it were spaghetti. He eats each mouthful    10    .The acting is so convincing that it makes you believe that it is one of the best meals he has ever tasted.

(1). The amber which    1     had a beautiful yellow-brown color like honey. The design of the room was in the     2     popular in those days. It was also a treasure     3     gold and jewels, which took the country’s best artists about ten years to make.

(2). I have become very important in communication,     4     and trade. I have also been put into robots and used to make mobile phones     5     help with medical operations....Anyhow, my     6     is to provide humans with a life of high quality…

(3). “What are you doing?” asked Daisy. “I’m protecting myself     7     mosquitoes,” it replied. When I find a millipede insect, I rub it over my body. It     8     a powerful drug which     9     mosquitoes. You should pay more attention to the rainforest where I live and     10     how the animals live together. No rainforest, no animals, no drugs.”