建筑工程已经在进行中。

Building work ___is already ___under ___way.

社会学家很清楚这一事实，并且正在进行实验以抵消这些不利因素。

Sociologists are well-aware of the fact and experiments ___are ___under ___way to counterbalance these disadvantages.

对此事的调查正在进行中，结果预计很快出炉。

The investigation into the matter ___is ___under ___way, and results are expected soon.