sentence: Jason thought it was convenient to be friends with Randy, so 
complete: Randy felt used in their relationship.

sentence: Karamo built a new pond for his koi fish so they could get out of their tank because the 
complete: pond was roomier.

sentence: When Brenda coated her wood panels with varnish, the concrete surface beneath got stained. The varnish harmed and uglified the 
complete:
concrete .