建筑工程将在秋季开始。

Building work will ___commence in the fall.

我们让会议开始好吗？

Shall we let the meeting ___commence?

配备着他们便宜的DV摄像机，与年轻的爱好者合作，他们努力展示困扰波兰人的问题，并设法开始了一场全国性的讨论。

Equipped with their cheap DV cameras, collaborating with young enthusiasts, they strive to show what is worrying Poles and manage to ___commence a national discussion.