他们在会议期间进行了富有成效的信息交流。

They had a productive ___exchange of information during the meeting.

这个农场提供食宿，以换取帮忙照看动物。

The farm offers room and board in ___exchange for help with the animals.

这是两位艺术家之间一次引人入胜的思想交流。

It was a fascinating ___exchange of ideas between the two artists.