复习这个单元的所有课文，然后看看你们是否理解每篇课文的大意。
Review all the lessons in this unit and see if you can understand the main idea of each lesson.
网上几乎有所有的材料，不论是课文文本还是讲座视频，这些还都免费。
Nearly everything, from texts to videos of lectures, is available online free.
在课文中所有表示将来进行时的动词下面划上横线。
Underline all the verbs in the passage which tell us what will be happening.
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