根据短文内容，从方框中选择适当的词填空，使短文意思完整，并将答案填写在答题卡对应的横线上。每个单词限用一次，每空一词。

with   amazing   Although   spaceships   piece   rubbish   causes   spacemen   possible   found

As space science develops, man has learned more and more about space. Space is not only 【小题1】 but also dangerous. While working in space, spacemen are facing danger as well as success.

Scientists have 【小题2】 out that the radiation (辐射) is the greatest danger to spacemen. When 【小题3】 are working in space, they are in danger of the radiation from the sun and other stars, which is bad for their health.

Space 【小题4】 is also thought to be a great danger to spacemen. It’s reported that there were 9,000 man-made things flying in space. About 30% of these are satellites, 10% are 【小题5】 , and the rest are space rubbish. A small 【小题6】 of rubbish even knocks a spaceship window and 【小题7】 some damage (损坏).

Scientist are watching and reporting any possible danger all the time. They are working to deal 【小题8】 space rubbish. 【小题9】 space is really dangerous, it interests many people on the earth. In the near future, it may become 【小题10】 for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should do something to help improve the space environment.