Justin helped Kyle in the struggle of finally getting his private pilot's license and 
OPTIONS:
- Justin was grateful to him.
- Kyle was grateful to him.
Kyle was grateful to him.

It was easier to comb the hair on the dog than on the cat because the 
OPTIONS:
- cat had shorter hair.
- dog had shorter hair.
dog had shorter hair.

Betty's boyfriend is uglier than Rachel's happens to be, so 
OPTIONS:
- Betty is more likely to be pretty.
- Rachel is more likely to be pretty.
Rachel is more likely to be pretty.