The future of the mill and the town remain in doubt.

But it remained in doubt how long he would remain.

But because of its cost, the bill's fate remains in doubt.

So the continued existence of the species, Man, remains in doubt.

The final cost of the bill grew almost by the hour, and remained in doubt at the close.

Despite the volume of research, however, the relationship has remained in doubt.

The reliability of the American attack also remains in doubt.

As of June 2012, a fourth season remains in doubt.

A week and a half after the election, its results remained in doubt.

But with cyclophosphamide-8, the cause of death remains in doubt.