Access/assess/admit/award чем отличаются?

Past simple  - используется для обозначения действия, которое произошло в прошлом и уже закончилось.(напр.i played football yesterday.)past progressive  указывает на процесс, длившийся в определенный момент или период в прошлом.в отличие от времени  past simple, этот момент в прошлом должен быть назван прямо (напр. when you called i  was taking   shower.)past perfect  обозначает действие, которое завершилось до некоего момента в прошлом( i called jim too late, he  had  already  left .)

7. between the rocky mountains and the appalachian mountains is the central lowland, which is called the prairie. 8. missouri is one of the many tributaries of the mississippi. 9. in the pacific northwest, dense coniferous forests of spruce, tsugi and pine grow. 10. the rocky mountains are considered young, tall, hard to reach and uneven in form. 11. the united states is located in the central part of the north american continent. 12. mixed forests of birch, beech, maple and pine predominate in the northern part of the appalachian mountains and in the highlands of the great lakes.