Question:
Kurt flew in Alex's plane, and he asked him to come again.

Who is he referring to in this sentence?
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Answer:
Alex


Question:
Scribes were often hired by nobles in the Medieval period although they were able to read and write themselves.

Who is they referring to in this sentence?
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Answer:
nobles


Question:
The University declared holiday to students because they requested them.

Who is they referring to in this sentence?
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Answer:
students


Question:
Stargate Atlantis was replaced by Stargate Universe since they were hoping that this show would do better in the ratings.

Who is they referring to in this sentence?
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Answer:

Stargate Universe