阅读下面短文，根据短文内容，完成下列各题。

As we all know, doing housework is helpful for teenagers development. Do teenagers in small villages do housework at home? How about the teenagers in big cities? We made a survey (调查) last month. We asked 4,000 teenagers in China. Half of them come from big cities. The others are from small villages. Let’s look at the result.

We can find out that teenagers in small villages do more housework than those in big cities. Maybe it is because teenagers in small villages live a harder life or their parents are too busy to look after them. As a result, teenagers in small villages are more independent than those in big cities. We will give our advice to parents in big cities. We think parents should give their children some housework to do because it’s a good chance (机会) for teenagers to learn how to take care of themselves. Besides, they should give their children more free time so that they can do what they love to do.

【小题1】Who does the underlined word “them” refer to (指代的是)?
It refers to ___________________.
【小题2】In the survey, how many more teenagers in villages fold the clothes than those in cities?
There are ___________________ more teenagers in villages fold the clothes than those in cities.
【小题3】Why do teenagers in small villages do more housework than those in big cities?
Perhaps because teenagers in small villages ___________________ or their parents are too busy to look after them.
【小题4】According to the passage, what can teenagers learn by doing housework?
They can learn ___________________.
【小题5】What do you usually do to help your parents at home?
I usually ___________________.