What is the main idea of the passage?

I’m not used to （ ） in that impolite way.

The speaker raised his voice but still couldn‘t make himself ().

The last time I saw her was () my brother’s wedding ceremony three years ago.

The degree （ ） you maintain your mental health may depend on certain simple environmental factors.

You （ ） have said that, now Grandma’s really angry.

Plastics is a kind of （ ） which is widely used in industry.

The effect of a volcanic eruption on climate may be to make it_________.

It is the ability to do the job （ ） matters not where you come from or what you are.

What does the author think a student should do if he has a boring teacher?

The underlined phrase “function below their ability shown by test scores” means the under-achievers ________.

The chief foods eaten in a country depends largely on （） best in its climate and soil.