New Words：

letter [ˈletər] 信;字母

Sample Sentences：

I had a letter from my sister.
There's no date on this letter.
We could write a letter to your father.
What do the letters SOS mean?
What is the middle letter in the word 'son'?

New Words：

fire balloon 热（空气）气球
hot air balloon 热（空气）气球

New Words:

thief [θiːf] 贼;小偷;窃贼
thieves [θiːvz] thief的复数;thieve的第三人称单数

Sample Sentences:

The dog ran after the thief.
The thief was jailed for one month.
A thief ran off with hundreds of pounds yesterday.

The thieves cut a hole in the fence.
Watch your bag ─ there are thieves around.

New Words：

stole [stoʊl] steal的过去式
stolen [ˈstoʊlən] v.steal的过去分词；adj.偷得的；偷走的

Sample Sentences：

He stole her money.
He stole money from her.
My wallet was stolen.
How much money was stolen?

New Words：

steal [stiːl] 偷;窃取

Sample Sentences：

Did you see that boy steal the money from that man?
"I'll never steal again! " cried Tom. "Only let me out, and I'll never steal again! "