Великие равнины начинаются от 97—98 ° западной долготы и являются по сути предгорным плато Кордильер. Высота равнин повышается при движении на запад от от 500 до 1600 м. Плато сильно расчленено, местами сеть долин слишком густая для их хозяйственного использования. На севере расположены Бэдлендс — «плохие земли» , почти лишенные почвенного покрова. Южнее — в Небраске горы Санд-Хилс. На территории штата Канзас располагаются невысокие горы Смоки-Хилс и Флинт-Хилс, а также возвышенность Ред-Хилс. Южную часть равнин занимают Льяно-Эстакадо и плато Эдуардс.
1. was, broke 2. graduated 3. become 4. were driving, happened 5. has been 6. got, learned, had 7. plays, is playing 8. prepared 9. has been teaching 10. changes, drops 11. saw, have not seen 12. has been raining, came 13. reached, found, had occupied, had chosen 14. you have just said 15. succeeded,had worked 16. had been 17. remained, had recovered, had received 18. heard, had given up 19. have not heard 20. has been 21. return. 22. have known, were23. is open 24. had reached25. will have become26. shrugged, shook, said27. went, has been working 28. will probably be having supper29. had never been
2. graduated
3. become
4. were driving, happened
5. has been
6. got, learned, had
7. plays, is playing
8. prepared
9. has been teaching
10. changes, drops
11. saw, have not seen
12. has been raining, came
13. reached, found, had occupied, had chosen
14. you have just said
15. succeeded,had worked
16. had been
17. remained, had recovered, had received
18. heard, had given up
19. have not heard
20. has been
21. return. 22. have known, were23. is open 24. had reached25. will have become26. shrugged, shook, said27. went, has been working 28. will probably be having supper29. had never been