政府正在考虑延长暑假的计划。

The government is considering plans to ___lengthen the summer holiday.

为了改善旅行，他们应该延长博物馆的参观时间。

To improve the tour, they should ___lengthen the visit to the museum.

春天白天变长，我们享受更多的日光。

As days ___lengthen in spring, we enjoy more daylight.