文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（
），并在其下面写出该加的词。删除：把多余的词用斜线（
）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。
Last week our class has a heated discussion on Earth Hour. Different students hold different opinion about this activity. About 60% of the students are in favor of it. Which is known to us all, global warming is a big problem in the world. Earth Hour can raise people’s awareness of global warming. However, turning off lights for an hour is energy-saving. Only through our joint efforts can we make it our earth a better place to live. However, about 40% of the students say this activity is not very meaningful. They think it is only a show or that it makes no difference. What’s more, turning off lights for an hour may cause inconvenient to people’s life, work and study. In our opinion, this activity is of great importance. But one activity alone is not enough if we want to save energy and protecting our earth. Let’s act through our day-to-day habits.
