【題目】The school has a system of r and punishments to encourage good behavior.

【答案】rewards
【解析】句意：這個學(xué)校有一套鼓勵良好行為的獎賞和懲罰機(jī)制。介詞后用名詞，根據(jù)并列名詞punishments可以得知也要用名詞復(fù)數(shù)，故填rewards。

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