阅读下面的短文,并根据各题所给首字母的提示,写出一个合适的英语单词完整、正确的形式。
Humans have dreamed of reaching the stars for (1) c
. The space age began in 1957 with the launch of Sputnik, the first man-made satellite. It was a great (2) s
for human space exploration. In 1961, Yuri Gagarin became the first human to orbit the earth in a spacecraft, which made people around the world (3) e
about the future of space travel.
Eight years later, Neil Armstrong stepped onto the moon. He said, "That's one small step for a man, one giant leap for mankind." Since then, we have sent probes to every (4) p
in our solar system and built the ISS, a place where astronauts from different countries live and work (5) t
.
Today, private companies are (6) c
space exploration in many ways. SpaceX, Blue Origin and others are developing reusable rockets to make space travel cheaper and (7) s
. They plan to send tourists to space and eventually build cities on Mars. Of course, space travel still needs advanced (8) t
and hard-working scientists.
Space exploration is difficult and (9) d
, but it has always driven human progress. We will (10) c
to reach further, unlocking the secrets of the universe and making our dreams come true.