她决定把裙子改长一英寸。

She decided to ___lengthen her skirt by an inch.

随着冬季临近，白天会逐渐变短。

The days will ___lengthen as winter approaches.

由于疫情，学校决定延长假期一周。

Due to the pandemic, the school decided to ___lengthen the holiday by one week.