Question

Вставьте предлог или послелог, где необходимо.  James is coming back ... school ... next Monday and his mother has asked me to explain ... the teacher the reason ... his absence. Though he recovered ... his flu ... last week, the doctor told his mother to keep him ... school ... a couple of days.

Answer 1

Back FROM school
reason OF his absence
recovered FROM his flue
keep him FROM school FOR a couple of days

Answer 2

 James is coming back from school  next Monday and his mother has asked me to explain  the teacher the reason of his absence. Though he recovered from his flu  last week, the doctor told his mother to keep him from  school for a couple of days.

Answer 3

James is coming back to school next Monday and his mother has asked me to explain to the teacher the reason for his absence. Though he recovered from his flu last week, the doctor told his mother to keep him out of school for a couple of days.