阅读下面的短文，根据短文内容，从方框内所给11个词汇中选择10个意义相符的词汇，必要时可加情态动词或助动词，进行词形变化，填入空白处。

send, go, become, discover, name, be, reach, imagine, have, get, run

The universe is very big. But how large is the universe? It is impossible 【小题1】 how large the universe is.

But we know the earth is our home. It is a planet and it 【小题2】 around the sun. The moon goes around the earth. There are seven other planets go around the sun. The sun and its planets are a system 【小题3】 the solar system. So far, some astronauts 【小题4】 to the moon. Some scientists 【小题5】 many spaceships to some other planets. But we haven’t 【小题6】 life on other planets, because none of them 【小题7】 an environment like the earth.

Scientists have also found many other galaxies in the universe. But they are very far away, so no spaceship has travelled far enough 【小题8】 them. Is there any life out of the solar system? Have there been visitors to the earth from other planets? I think there is still a long way 【小题9】 to know that. When I grow up, I 【小题10】 an astronaut and work for China’s space station.