You need't ____what other people think.

一个一个来筛选：
worry 单个不可,接about可.
worry for 后面应该接sth例如worry for you 为君愁.
磨着要(某物)：
The girl worried her mother for a doll.
小姑娘缠着她妈妈给她买个娃娃.
短语
All that worry was for nothing.所有的担心都是没有必要的
A century of worry|for nothing.人们担心了近一个世纪
worry for you 为君愁
Inflation is a worry for policymakers in other emerging markets too .
通货膨胀也困扰着其他新兴市场的决策者.
care for
1.
喜欢
Would you care for a drink?
你想来点喝的吗?
2.
照料
Who will care for the house while the family is away?
全家人都不在时,由谁照料这间房子呢?
3.
计较
He doesn't care for what he eats.
他对吃的东西并不计较.
C
You need't care what other people think.
另举一句
I don't care about what you are talking.我不在意你说的.