克隆人类或许是可行的，但这符合道德吗？

It may be ___feasible to clone human beings, but is it ethical?

在新加坡这样土地稀缺的城市，拓宽现有道路通常是不可行的。

In a land-scarce city like Singapore, widening existing roads is often not ___feasible.

在评估了资源后，团队得出结论，在六月份之前启动该项目是可行的。

After reviewing the resources, the team concluded that launching the project by June was ___feasible.