You will certainly have to work hard, but something tells me that you are not afraid of hard work.

We need hard and fast rules.

I believe they have worked very hard.

We find this hard to grasp.

It has been a long and hard road.

7219 Indeed, making cover for biometric risks obligatory would be likely to make the system very inflexible.

There seem to be intractable technical problems but we are definitely working on it.

But certain problems continue to be intractable, even if things are moving in the right direction.