Question:
The product fair showed Office 365, and it had a lot of attendees.

Who is it referring to in this sentence?
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Answer:
The product fair


Question:
Will Smith got his son in a movie since he has much influence in the movie scene.

Who is he referring to in this sentence?
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Answer:
Will Smith


Question:
The police arrested suspected members of Anonymous because they are cracking down on hackers.

Who is they referring to in this sentence?
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Answer:
The police


Question:
The cat broke the glass because it was fragile.

Who is it referring to in this sentence?
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Answer:

the glass