老师同意给我三天的延期来交作业。

The teacher granted me a three-day ___extension to submit my assignment.

我们给客厅加了个小阳台作为延伸部分。

We added a small balcony as an ___extension to the living room.

请拨打分机号321联系技术支持部门。

Please dial ___extension 321 to contact the technical support team.

她买了黑色接发来增加头发长度。

She bought black ___extensions to add length to her hair.