New Words：

sign [saɪn] 招牌;标牌;指示牌;标志

post [poʊst]

v. 邮寄；寄；把(信件等)投入邮筒；投递
n. 柱；桩；标志杆

Sample Sentences：

There's a big sign in front. You can't miss it.
The sign on the wall said ‘Now wash your hands’.

Could you post this letter for me?
I'll post the letter when I go out.
Do you need to post them, or just email them to you?
"Will you post this letter for me?" " No, it's too cold to go out."

New Words：

cover [ˈkʌvər]
v.盖；覆盖；掩盖
n.封皮；封面；盖子；遮盖物

Sample Sentences：

The country is covered by forest.
She covered her face with her hands.
She covered the food with a piece of cloth.

He always reads the paper from cover to cover.
Write your name on the front cover of the book.

New Words：

at all 完全；根本；一点也不；丝毫
Not at all 一点也不；根本不；不用谢；别客气

Sample Sentences：

I don't like swimming at all.
She did not know Chinese at all, even pinyin!
You must be very patient. Do not move at all until I tell you.

"Thank you for helping me. " "Not at all. "
Would you mind if I turn off the radio? --Not at all.
'Thank you very much for speaking with us.' — 'Not at all.'

New Words：

fail [feɪl]
v.失败；不及格；倒闭；破产
n.（考试）不及格；不合格

Sample Sentences：

I didn't fail the exam.
It's better to try and fail than never try at all.
If I fail the exam, my parents won't let me play anything.
The child was killed when a car failed to stop at the crossing.

at all 完全；根本；一点也不；丝毫

New Words：

matter [ˈmætər] n.问题；事情

Sample Sentences：

What's the matter with you today?
There's something the matter with my eyes.
What's the matter? Is there something wrong?
Is something the matter with Bob? He seems very down.