5. 运动使我的肌肉变得很结实。
Exercise _______ my muscles very ________.
6. 他解释了声音如何在水中传导。
He gave an ______________ of how ________ __________ in water.
三. 根据所给提示，用本单元所学的单词完成句子。
1. We all __________ (desire) peace and happiness.
2. He ________ (pile) old paper in the corner of the room.
3. He ________ (scan) the horizon, looking for land.
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