17.　 The number of people infected with AIDS is increasing at an astonishing speed and some of them are facing death.

16.　 at the end of the discussion

15.　 get money to complete their projects

14.　 the first person to travel in time

13.　 the first cloned human being

12.　 a word from the Greek language

11.　 the first words of The Constitution of the United States of America

10.　 set foot in/on …

9.　　　 one giant leap for mankind

8.　　　 have a lot in common, in common with