QUES:
Who is he in the following sentence?

Aaron kissed Dan because he wanted to.

ANS:
Aaron

QUES:
Who is they in the following sentence?

When the preschoolers visited the senior citizens, they were very hospitable.

ANS:
the senior citizens

QUES:
Who is his in the following sentence?

Stephen Colbert is funnier than John Stewart since his show has less viewers.

ANS:
John Stewart