1, a three-day holiday 的 a 一定要加的
2, I think a three-day holiday is too short for travel and therefore we didn't go out.
3, It's wonderful for you to have a three-day holiday. We don't have a day of holiday and even need to work overtime.
4, How have you been in the three-day holiday?
5, Where do you plan to go to in the coming three-day holiday?
6, Where do you want to travel to if you have a vacation/long vacation?
满意请采纳!