[填空题]People have dreamed of traveling in space for thousands of years. But it was not until 1957 that it became a{{U}} (36) {{/U}} On October 4,1957 Russia{{U}} (37) {{/U}}the first man-made satellite into space, It was called Sputnik I. On April 12,1961 the Russian{{U}} (38) {{/U}}Yuri Gagarin became the first man to orbit the Earth. The first spacewoman in the world was Valentina Tereshkova. She made 48{{U}} (39) {{/U}}in 1963 in her Vostok 6. On July 20,1969 the American{{U}} (40) {{/U}}Neil Armstrong became the first man to set foot on the Moon. In 1986 the Russian space station Mir was launched. Scientists are already at work on the{{U}} (41) {{/U}}Space Station, a "city of space". It will be the size of a football field and will{{U}} (42) {{/U}}over 200 tons. A team of 10 --15 spacemen will{{U}} (43) {{/U}}be able to live and work at the International Space Station in 2005. The next step will be the first moon base. 20 or 30 scientists will live inside