Sentence 1: Ken had to turn his rented car in and needed a lift. 
 Sentence 3: The two men arrived at the rented place early in the morning 
 Sentence 4:  As the door was closed they had to wait five minutes 
 Sentence 5:  But as soon as it was done, Steve drove Ken back to his house 
 Option 1: He called Steve who accepted to help him. 
 Option 2: He called John who obliged to help him.