这条路在拐弯处变宽了，方便车辆通行。

The road ___broadens at the turn, making it easier for vehicles to pass.

阅读不同类型的书籍可以拓宽你的知识面。

Reading various types of books ___broadens your knowledge.

这项新政策旨在扩大社会福利的覆盖范围。

The new policy aims to ___broaden the coverage of social welfare.