QUES:
Who is he in the following sentence?

Todd was offered a recruitment letter from the Dean of Admissions himself since he wanted to recruit such talent into their athletics department.

ANS:
the Dean of Admissions

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 he in the following sentence?

Mike helped Jack with his assignment because he felt like doing so.

ANS:
Mike