New Words：

exist [ig'zist] v. 存在；生存

Sample Sentences：

Man cannot exist without air.
He walked past me as if I didn't exist.
The problem only exists in your head, Jane.
Few of these monkeys still exist in the wild.

New Words：

planet ['plænit] n. 行星；地球（尤指环境）
what planet is sb. on? 指某人的想法完全不切实际

Sample Sentences：

The planets move around the sun.
Does life exist on other planets?
They claimed to have discovered a new planet.
Mars is the fourth planet in order from the sun.
He thinks being a father is easy. What planet is he on?

exist [ig'zist] v. 存在；生存
claim [kleɪm] v.声称；宣称

New Words：

chore [tʃɔ:r] n.家务活；杂事

Sample Sentences：

It' s such a chore to do the shopping every day !
As a child one of my chores was to feed the animals.
Each morning I get up and do the chore before I go out.

New Words：

familiar [fəˈmɪljər] adj. 熟悉；熟悉的；常见到的
bakery ['beikəri] n. 面包店

Sample Sentences：

Your face seems familiar.
You look familiar to me. Have I met you before?
He looks so familiar but I can't remember his name.
The smell is very familiar to everyone who lives near a bakery.

New Words：

catch on 流行起来；变得流行；理解；懂得

Sample Sentences：

It is a nice song and I think it will catch on quickly.
I don't think I catch on. Could you try to explain the problem again?

I didn't catch on to this joke.
I don't quite catch on to what she is saying.