The book is the most difficult ______ the three. [ ]

Could you please the radio a bit? It’s too loud. —Sorry, I’ll do it right away.

Doing exercise for_____ hour every day is good for your _____ uncle.

Have you finished your work yet?　—No, not yet. I think it’ll take _____ ten minutes.

I was so tired after a day of hard work that I could ______ move any longer.