Still, it proved too hard to keep their children with them.

But then, everything was proving harder than he had thought.

The area just south of Baghdad has proven particularly hard to control.

Its leadership has proved too hard to touch, to control, and it is close to my base.

Reconciliation, it seems, may prove harder to win than a return to peace itself.

The aircraft also proved difficult to fly and extremely hard to control on the ground.

The idea has proven popular with parents and hard to oppose politically.

This is the primary reason why it has proved so hard to achieve structural change in many areas.

But I didn't want to feel sympathy for her, either, and that was proving harder to avoid.

It was a very unpopular levy as gold proved so hard to get.