4.
Language study:

1.Tom’s sister wouldn’t change her mind.
change one’s mind 改变主意
make up one’s mind 下定决心
2.It is said to be the city’s largest ever cultural relics repair project.
it 指代上文中的Beijing plans to repair its old city wall而不是形式主语。
It is said to be the best book, but I don’t think so.
=It is said that it is the best book, but I don’t think so.
You are said to know the accident.
=It is said that you know the accident.
3.So far, more than 200,000....
so far 迄今为止
So far, so good.
Integrating skills:
1.To make your voice heard, you can write a letter to a newspaper editor.
to make your voice heard 不定式作目的状语
He was running to catch the bus.
辨析：不定式与现在分词作结果状语
现在分词作结果状语时，表示前一个动作造成的结果，不定式也可作结果状语，通常表示一个未曾料到的不愉快的结果。
He got home to find that his father was ill.
The child fell, striking his head against the door and cutting it.
2.No, the pollution does not come from cars or factories, but from human beings.
not...but... 不是...而是....
I haven’t come for pleasure but for business.
Not you but he is to be punished.
生词表: