Complete the following sentences according to the Chinese given.
1.Long ago people thought that the moon___(是一个大盘子)
2.I hope that I___(成为一个宇航员)
3.Scientists say that people___(将来可以在月球生活)
4.Scientists belive that___(火星上过去有生命)
5.He tells me that the nature___(太美妙了)
6.I think that the stars___(在夜晚看上去很美)