翻译下列词组。乘火车____________骑自行车_____________到达学校_____________坐地铁_____________多长时间______________
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？
Please keep （安静）when you are in a library．
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