词汇运用。
1.              (没有一个) of us has been to the USA.
2.  Our solar system is only a            (部分) of the galaxy.
3.  Are we            (孤独的) in the universe?
4. Their light has traveled several years to            (到达) us.
5.  I hope to meet a            (真正的) astronaut one day.
6.  We are good friends because we like the            (相同的) things.
7.  What            (外国的) language have you studied recently?.
8.  People in China and            (国外) have given money to help poor children.
9.  He stopped going to school a            (少数) years ago.
10.  That            (听起来) interesting.