题目内容
Although secondary education is _________(必须的，义务的）， parents are not required to send their children to state schools.
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Tim streched out a hand in apology for his thoughtless remarks and was _______(安慰） by a firm handshake from Mark.
I told him that I had ________(授权）him to act for me while I was away from office.
They live their own tribes and have their own ways of fighting, which makes them easily ________( 可区别的）
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