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根据短文内容选择可以填入空白处的最佳答案。(Choose the best answers to complete the passage．)

　　A long time ago, it was not easy to 　　1　　 around．Then we built ships．We made horses pull goods．We 　　2　　 bicycles, cars, trains and other means of transportation．We made all these things, so travelling became 　　3　　．

　　But we did not stop there．We looked 　　4　　 in the sky and wanted to fly like birds．So we made hot air balloons and gliders．　　5　　, the Wright brothers built the first airplane about 100 years ago．Ever since then, travelling 　　6　　 even easier!

　　But we still did not stop there．We looked up in the sky again and wanted to visit other planets．We wanted to know 　　7　　 the universe was like．We had 　　8　　 questions．We would not have any answers 　　9　　 we could travel in space．So we began trying．

　　　　10　　 fifty years ago, both the U．S．and Russia wanted to be the first country 　　11　　 people to space．Russia won．In April of 1961, Russia sent a craft to space．Yuri Gagarin flew the craft．He became the first person to see the Earth from space．He circled 　　12　　 the Earth once．The flight 　　13　　 1 hour and 48 minutes．The following month, the U．S．sent its first craft to space．Alan Shepard flew the craft．He did not circle around the Earth．He was only in space 　　14　　 15 minutes．

　　In the next several years, the U．S．and Russia continued the space race．

　　Russia won many more times．For example, Russia sent the first woman to space in June of 1963．Two years 　　15　　, Alexei Leonov from Russia became the first person to walk in space．

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