t think it easy, even if we work hard,______ the South Korea and the North Korea to sit down to talk at present

下列词语中，字形都正确的一组是（ ）

Many students are in a puzzle about the different languages of the country, but if you study the history of it, you can easily ____ this question.[ ]

There’s a coffee shop on one side of the river and a restaurant on__________.

I often think of the years ____ I worked with the foreigners, ____ has had a great effect on my later life.