翻译题,请把汉语翻译成英语

The problem we disscussed the day before yesterday was very important.

The book written by that writer is very populor among the young people.

The day before yesterday,the issue we discussed in the conference is very important.
That author's books (are well received by young people.)/are popular among the young./gain young people's popularity very much.

During the meeting the day before yesterday to discuss a very important question that the author who wrote two books popular among young people