Определите время глагола и поставьте 3 специальных вопроса к предложениям. 1) i have made some mistakes in this exercise. a) who b)were c)how many 2) the doctor wisited his patients at home an hour ago. a) when b) where c)whom 3) human heart pumps blood through the body. a)where b) what c) what

1) past simple/ 1)who have made some mistakes in this exercise
2)where were made some mistakes 3) how many mistakes  were  made in this exercise
2) past/ when the doctor visited  
where the doctor visited a patient
Whom a doctor visited
3)  where a heart pumps blood
what shakes the heart pump