So I worked hard at college on English.

因此，我上大学是学习英语很刻苦。

youdao

Ever since grade school, I was told to get good grades so I worked hard at it.

从小学那时起，我被告知要取得好成绩，所以我努力学习。

youdao

In college, I was told that engineers would always be in demand so I worked hard in that major.

在大学，我被告知社会需求一直需要工程师，所以我努力地学那门专业。

youdao

"That is why I ran for president. That is why you worked so hard to elect a Democratic Congress.

VOA: standard.2010.02.06

"And I am grateful for their decision as well as all the Democrats who have worked so hard to make this reform a reality."

VOA: standard.2010.07.13

"I had worked so hard and felt like I had so little to show for it and I just went a little crazy, " she said.

CNN: A matter of life and debt: An overspender's story

It is wonderful to be back at GW. I want you to know that one of the reasons that I worked so hard with Democrats and Republicans to keep the government open was so that I could show up here today.

WHITEHOUSE: The Country We Believe In: Improving America��s Fiscal Future | The White House

I've worked hard in life so I can buy what I want.

BBC: Why do people still buy personalised number plates?