fill in an application填写申请表

fill in an order form填写订单

Please fill in the blanks. [=put information in the blank spaces]请填空。

At the end of the movie, the narrator goes back and fills in (all) the blanks. [=the narrator provides missing information about the movie's plot]在电影结尾时，叙述者回溯到过去，揭晓了情节中留下的（所有）悬念。

Just tell me the most important parts—you can fill in the details later.告诉我最重要的部分就行——详情可以以后补上。

I missed the meeting so I need someone to fill me in (on what happened).我没参加会议，因此需要有人告诉我会议的情况。

She filled us in on the details.她把详情告诉了我们。

He can't be here today, so he asked me to fill in.他今天来不了，所以让我来替他。

He asked me to fill in for him.他让我临时代替他。