New words：

solo ['səuləu]
n.独唱；独奏；独舞；单人表演
adj.独自的；单独的；独唱的；独奏的

Sample Sentences：

The concert began with a piano solo.
He has been asked to sing a solo at the concert.
This was definitely a successful solo trip for me.

New words：

risk [risk]
n.风险；危险；危险人物；会带来风险的事物
v.使…冒风险（或面临危险）；冒…的风险（或危险）；冒险做

Sample Sentences：

He risked his life to save her.
He saved my life at the risk of losing his own.
It was a difficult decision but we decided to risk it .
The disease is spreading, and all children under 5 are at risk.

New words：

be terrified at/with 被……吓一跳
be terrified of 对……感到害怕

Sample Sentences：

I'm terrified of flying.
I used to be terrified of the dark.
The small girl was terrified at that big black cat.

New words：

terrify ['terəfai] v. 使恐惧；使十分害怕；使惊吓
terrifying ['terə.faɪɪŋ] adj. 可怕的；令人害怕的

Sample Sentences：

Flying terrifies her.
It was a terrifying experience.
The animals were terrified by the storm.
There was no doubt they must have been terrified.

New words：

moldy ['məuldi] adj. 发霉的；破旧的；乏味的；陈腐的

Sample Sentences：

Strawberries go moldy very quickly.
We had a moldy holiday - it rained every day.
I'm sure it's still good, if we just cut off the moldy parts.