We'll be away for two weeks because we'll have a_________这个横线上填 two-week holiday还是 two weeks' holiday?

We'll be away for two weeks because we'll have a_________这个横线上填 two-week holiday还是 two weeks' holiday?
We'll be away for two weeks because we'll have a_________
这个横线上填 two-week holiday还是 two weeks' holiday?

We'll be away for two weeks because we'll have a_________这个横线上填 two-week holiday还是 two weeks' holiday?
two-week holiday两周的假期=two weeks' holiday
但是two weeks' holiday不能加冠词a