1.Linda froze when she saw the picture。（froze下划线）
2.We should stop them from polluting water。（polluting 下划线）
3.I didn´t wash clothes by myself in the first place。（in the first place下划线）
4.Students should obey teachers at school。(obey下划线）
5.All water returns to the sea in the end。（returns下划线）
求解！~~
Linda froze when she saw the picture。琳达看到那张照片时吓呆了。 froze是freeze的过去式，原意为因寒冷颤栗。现引申为吓呆了。
We should stop them from polluting the water。我们应该停止对水资源的污染。polluting是pollute 的现在分词形式。因为有固定短语 stop sb from doing sth。 意思为阻止某人做某事。
I didn´t wash clothes by myself in the first place。首先我自己不会主动去洗衣服。 in the first place 是个固定短语，作首先解释。
Students should obey teachers at school。 在学校里学生应该遵守老师的规定。obey 是服从的意思。
All water returns to the sea in the end。所有的水最终返回到大海里。returns 有返回的意思。