QUES:
Who is they in the following sentence?

The students fell asleep during the professor's lectures because they were bored.

ANS:
The students

QUES:
Who is they in the following sentence?

England won the bid over Spain because they did not prepare thoroughly.

ANS:
Spain

QUES:
Who is he in the following sentence?

Heath Ledger was considered the greatest Joker of all time by Ebert, but he cannot make that decision for all critics.

ANS:
Ebert