1 . 对于一个孩子来说，这篇文章是难以理解的。(It +be +adj.+for sb.+to do sth.)
_________________________________ this article.

2 . But spending too much time online is unhealthy and _________________ (使……很难集中精力于) on other things in life. (根据汉语提示完成句子)

4 . 人们一致认为环境污染已经成了最严重的问题之一。（recognize）
______ ______ ______ ______ environment pollution has become one of the most serious problems.

6 . 看到陌生人之间这般彼此关照，实在令人感动。
________________ to see how much strangers could care for each other.

7 . 最后但同样重要的是，对我们学生来说，养成一个好的学习习惯很重要。(it作形式主语)
Last but not least, _________________ a good study habit.

8 . It is natural for a teenager at that age to feel he or she likes somebody. (it作形式主语)
仿写In many cases, it was said that___________________________________ .
在很多情况下，代沟问题是很难解决的。