Yes,it was.

是，是十二月份。

It doesn't matter to me.

两个都可以。

Yes, I worked from early morning until late at night.

是,我从清早工作直到半夜。

They don't know when the wedding will be.

他们不知道婚礼将是什么时候。

After that,I go downstairs to the kitchen to have breakfast.

在那以后，我去楼下厨房吃早餐。

I'm a new employee.I was hired yesterday.

我是昨天被雇用的新雇员。