1. D) Her little brother.
2. B) By selling lemonade and pictures.
3. B) Providing clean energy to five million people.
4. C) They can be laid right on top of existing highways.
5. C) Endless fighting in the region.
6. D) To find evidence of the existence of the "lost lions".
7. A) Lions' tracks.
8. D) Her 'lucky birthday'.
9. A) Threw her a surprise party.
10. C) The trip her husband has planned.
11. B) He is eager to learn how the couple's holiday turns out.
12. D) They are sensitive to the dynamics of a negotiation.
13. A) They know when to stop.
14. B) They learn quickly.
15. C) Get to know the other side.
16. A) How space research benefits people on Earth.
17. C) They developed objects for astronauts to use in outer space.
18. B) They are extremely accurate.
19. C) It marked the beginning of something new.
20. D) They believed in working for goals.
21. B) Doing needlework by the fire.
22. A) Sit down and try to calm yourself.
23. C) You may expose yourself to unexpected dangers.
24. A) Walk uphill.
25. D) Inform somebody of your plan.