【正文】
ng, we know that there is no air, no plants, no water and no life there. So scientists are doing experiments 7 many ways. They 8 solve a lot of problems 9 humans can live on the moon. I’m sure the dream must 10 in the future. Maybe it is in the next century. ( ) 1. A. be B. are C. has D. have ( ) 2. A. to B. at C. with D. for ( ) 3. A. standing B. sitting C. sleeping D. doing ( ) 4. A. saying B. telling C. thinking D. knowing ( ) 5. A. satellite B. sun C. star D. sky ( ) 6. A. see