为了启动这个项目，她提交了一份全面的提案来开个头。

To kick off the project, she ___set ___the ___ball ___rolling with a comprehensive proposal.

他充满热情的演讲为社区募捐活动开了个好头。

His enthusiastic speech ___started ___the ___ball ___rolling for the community fundraising campaign.

一旦有人用一个新想法开了头，其他人通常很快就会加入进来。

Once someone ___sets ___the ___ball ___rolling with a new idea, others are often quick to contribute.