完形填空。 There are many people in the world now. There 1 a lot more people next century. So the earth will be very 2 and there will be a little room for each person. Maybe there will be only 3 room on the earth in 600 years. That will be a very serious 4 . So man is 5 of a way to solve the problem. The moon is the satellite (卫星) of the earth. Man will probably go to 6 there some day. But there is no air, no plants and no life on the moon. So 7 are doing experiments in many ways. They 8 solve many problems 9 man can live on the moon. I'm sure our dream will 10 next century. Do you think so? ( )1. A. are ( )2. A. small ( )3. A. standing ( )4. A. example ( )5. A. saying ( )6. A. see ( )7. A. tutors ( )8. A. may ( )9. A. before ( )10. A. come in B. will be B. popular B. sitting B. fact B. telling B. sleep B. adults B. have to B. after B. arrive at C. has C. crowded C. bed C. question C. thinking C. work C. astronauts C. could C. since C. come true D. will have D. noisy D. bath D. problem D. knowing D. live D. scientists D. are able to D. till D. become real