I decided to branch out on my own.

我决定自己开业。

《牛津词典》

I decided to conduct an experiment.

我决定做一项实验。

《柯林斯英汉双解大词典》

I decided to act dumb.

我决定装哑。

《牛津词典》

Although I didn't tell anyone about my secret world, I decided to spend my life studying the microscope.

VOA: special.2009.07.18

And so I decided to have a progressive scale that increases according to what you earn like the tax scale.

所以，我决定制定一个累进的捐款标准表,捐款的数量随着收入的增加而增加,就像税率表一样，这个标准表从收入的1%起步。

普林斯顿公开课 - 人性课程节选

So, I applied to a lot of schools and from the ones I got in, I decided to come to Yale.

所以我申请了很多学校，从录取我的学校里选择了耶鲁。

来自西班牙的留学生 - SpeakingMax英语口语达人

It was in Terminal 1 where I decided to avail myself of a pedicure.

BBC: Changi: The airport of your dreams

Which is why I decided to learn more about their plight and our nation's legal and social response.

CNN: Don't turn your back on these children

Over the weekend, I decided to ask the bank how best to handle this.

FORBES: How Long are Undeposited Checks Good?