志愿者们在社区里挨家挨户地寻求支持。

Volunteers are ___canvassing door-to-door in the neighborhood for support.

在投票之前，我们需要全面考虑所有可能的选项。

We need to ___canvass all possible options before voting.

志愿者们挨家挨户走访，收集居民对社区改造的意见。

Volunteers ___canvassed the neighborhood to collect residents' opinions on community improvements.