几条主要高速公路上的维修工作正在进行中。

Repair work is ___in ___progress on several major highways.

剧院因翻新正在进行而关闭。

The theater was closed because renovation was ___in ___progress.

这项研究目前正在进行中，将于下个月完成。

The research study is currently ___in ___progress and will finish next month.