New Words：

enemy [ˈenəmi] n. 敌人；敌军；敌国；仇人

Sample Sentences：

The enemy are on the march.
Don't make an enemy of him.
The city is under enemy control.
They sent the enemy ship to the bottom of the sea.

bottom [ˈbɒtəm] n. 底部;最下部

New Words：

curious [ˈkjʊriəs] adj.好奇的；奇异的；古怪的
curiously [ˈkjʊriəsli] adv.好奇地；奇妙地

Sample Sentences：

I'm curious to know what you think about this.
They were very curious about the people who lived upstairs.

"Who's that boy? " she asked curiously.
A monkey behind the tree looked at us curiously.

New Words：

treat [triːt] v. 对待；处理

Sample Sentences：

My parents still treat me like a child.
I don't like the way you treat your children.
I believe customers should be treated like friends.
Students were angry at being treated like children.

New Words：

square [skwer] n. 平方；正方形；四方形；正方形物；广场

Sample Sentences：

The square of 7 is 49.
A square has four equal sides.
The little girl drew a square on the paper.
Today, my sister and I went skating on the square.
Excuse me. Can you tell me where the Tian'anmen Square is, please?

New Words：

million [ˈmɪljən] num. 一百万；大量
billion [ˈbɪljən] num. 十亿

Sample Sentences：

Last year we sold over one million mirrors.
There were millions of people in the square.
What would you do if you won a million pounds?

A billion is a large number.
There are 1.4 billion people in China.

square [skwer] n. 平方；正方形；四方形；正方形物；广场