Почему в горных районах, расположенных на высотах более 3500м. над уровнем моря, даже у здоровых людей появляется одышка,

1.said that she had gone..three days before
2...told the pupils(сказал или reminded-напомнил)that he had already expl..that rule
3...told Bob to stay at home and wait for him
4.My..wandered..what I usually did on Sunday
5.Sasha said to..that he wouldn't go to.. the following day
6...says to Nick that he doesn't want..their room
7...wandered when I would take her..
8.tells me to go and help..
9.said to Mike that they were going ..
10.says that she often cooks...