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.
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.
答案：1. centuries 2. success 3. excited 4. planet 5. together 6. changing 7. safer 8. technology 9. dangerous 10. continue
解析：
本题是译林版九年级全册Unit4的首字母填空题，结合太空探索的主题语境、固定搭配和语法规则逐空推导：
1. 固定搭配for centuries意为“数个世纪以来”，符合“人类长久以来梦想抵达星空”的语境，首字母c提示，填centuries。
2. 发射第一颗人造卫星是人类太空探索的重大成就，a great后接名词success，首字母s提示，填success。
3. 固定结构make sb. excited about sth. 表示“让某人对某事感到兴奋”，符合加加林完成绕地飞行后世人的反应，首字母e提示，填excited。
4. 句意指向太阳系的每一颗行星发射探测器，every后接单数名词planet，首字母p提示，填planet。
5. 国际空间站是各国宇航员共同生活工作的场所，用副词together修饰动作live and work，首字母t提示，填together。
6. 本句为现在进行时（be doing结构），句意为私营公司正从多方面改变太空探索的面貌，首字母c提示，填changing。
7. and并列两个比较级，和cheaper对应，使用可回收火箭能让太空旅行更便宜也更安全，首字母s提示，填safer。
8. 太空探索离不开先进技术，advanced后接名词technology，首字母t提示，填technology。
9. and并列两个形容词，和difficult对应，太空探索既困难又危险，首字母d提示，填dangerous。
10. 情态动词will后接动词原形，continue to do sth. 意为“继续做某事”，符合人类将持续探索宇宙的语境，首字母c提示，填continue。
1. 固定搭配for centuries意为“数个世纪以来”，符合“人类长久以来梦想抵达星空”的语境，首字母c提示，填centuries。
2. 发射第一颗人造卫星是人类太空探索的重大成就，a great后接名词success，首字母s提示，填success。
3. 固定结构make sb. excited about sth. 表示“让某人对某事感到兴奋”，符合加加林完成绕地飞行后世人的反应，首字母e提示，填excited。
4. 句意指向太阳系的每一颗行星发射探测器，every后接单数名词planet，首字母p提示，填planet。
5. 国际空间站是各国宇航员共同生活工作的场所，用副词together修饰动作live and work，首字母t提示，填together。
6. 本句为现在进行时（be doing结构），句意为私营公司正从多方面改变太空探索的面貌，首字母c提示，填changing。
7. and并列两个比较级，和cheaper对应，使用可回收火箭能让太空旅行更便宜也更安全，首字母s提示，填safer。
8. 太空探索离不开先进技术，advanced后接名词technology，首字母t提示，填technology。
9. and并列两个形容词，和difficult对应，太空探索既困难又危险，首字母d提示，填dangerous。
10. 情态动词will后接动词原形，continue to do sth. 意为“继续做某事”，符合人类将持续探索宇宙的语境，首字母c提示，填continue。