sentence: Monica just got their period and was out of tampons but Rachel had plenty. 
complete: Monica had to go to Walgreens to buy more.

sentence: Elena stopped being friends with Katrina because 
complete: Katrina was very selfish and never reciprocated the favors and help she was received.

sentence: Elena enjoyed watching the horror movie much more than Katrina, because 
complete:
Katrina disliked feeling scared.