题目内容
1.The little girl broke the window __________.(意外地)
2.He got bad grades in the math exam. His parents were __________him. (担心)
3.Olympic Games ________every four years. (发生)
4.He looks up to those ________.(民族英雄)
5.________is the hottest topic all over the world at present. (环境保护)
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