昨天Amy到达之前，我们已经完成了工作。我很高兴他在英语上已经远远地超过了我。警察说他们将勘察现场寻找更多的指纹和其它线索。那只小狗必须立刻动手术，否则它将流血致死。为了保持健康，我们别无选择只有健康饮食和加强锻炼。
I believe exercise and （新鲜的）air are good for our health．
It's important for teenagers to have good （习惯）
Jack looked through the （介绍）about the book before he decided to buy it．
Students should answer questions loudly and （清楚）in class．
Do you need to （讨论）the problem in groups？
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