You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

Q: Math was the simple paper in the exam and Chemistry the difficult because the _ had a strict teacher.

A: Math
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Q: The cooking spray worked a lot better than the butter, because the _ covered the whole pan more.

A: spray
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Q: Amy wrote a letter to Kai to send a clear message, Kai replied Ami with a poem which was obscure, because of the _ Kai knew how Ami feels.

A:
letter
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