Kindly explain 1part of editing..

There is an error in each line. Write the incorrect word and the correction in your answer sheet.
1. 

	Incorrect	Correct
He start to complain about the wicked world,	(a) ___________	___________
but is interrupted by a knock at the door.	(b) ___________	___________
A girl came in and puts five hundred rupees	(c) ___________	___________
on his desk. I find this outside. I find this outside, she said.	(d) ___________	___________