Question:
The mouse ran from the cat all the way to the kitchen because it was scared.

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

Question:
The environmentalists were angry at the corporation because they saw them polluting the creek.

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

Question:
Jackie Chan learned some things from watching Bruce Lee because he could watch his acting from the past.

Who is he referring to in this sentence?
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Answer:
Bruce Lee

Question:
The man asked Mark the question again because he was curious.

Who is he referring to in this sentence?
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Answer:
The man