【推荐1】He has _________ who are in need of help. (it作形式宾语)
他已经把帮助那些需要帮助的人当成了一种习惯。

【推荐2】find it＋adj.＋to do sth中it为形式宾语，动词不定式是真正的宾语
教材原句：It would not be surprising if we found it difficult to distinguish between reality and science fiction in the future.
仿写：只要你提前简要地了解唐朝历史，你会发现学习唐诗很容易。
________________ as long as you understand the history of Tang Dynasty briefly ahead of time.

【推荐2】我们要花很长时间在这两个城市之间架起一座桥梁。
_________ between the two cities.