New Words：
free [friː] adj. 自由的；免费的；随心所欲的；不受限制的
Sample Sentences：
I don't have much free time.
It's a free country; I'll say what I like!
The breakfast is free; you need't pay for it.
How much of their free time do you think children in your country spend on reading?
New Words：
sour [ˈsaʊər] adj. 酸的;有酸味的
Sample Sentences：
This pear tastes a bit sour.
The fruit is still green and eats sour.
I like fruit. But I don't like grapes. They're sour.
New Words：
ripe [raɪp] adj.成熟的；时机成熟的
Sample Sentences：
Was the peach ripe or green?
Don't pick those apples until they are ripe.
They decided to wait until the time was ripe.
New Words：
rude [ruːd] adj. 粗鲁的；无礼的
Sample Sentences：
Why are you so rude to your mother?
It's rude to speak when you're eating.
I don't wish to be rude, but could you be a little quieter?
New Words：
tongue [tʌŋ] n. 舌头
stick out 伸出
Sample Sentences：
The dog's tongue was hanging out.
She made a face and stuck out her tongue at him.
It's very rude to stick your tongue out at people.
His name was on the top of my tongue, but I just couldn't remember?
rude [ruːd] adj. 粗鲁的；无礼的