How to use "required" in a sentence

To those people in the huts and villages across the globe struggling to break the bonds of mass misery, we pledge our best efforts to help them, help themselves, for whatever period is required - not because the communists may be doing it, not because we seek their votes, but because it is right.

The focus of all the seats was the immense stage, a marvel of the size required for a Las Vegas spectacular, more than half again as large as the largest stage on Broadway

Unable to prove his identity, he was required to pay for both nights in advance, which he did, taking the money from a wad of cash he'd stuck in his pocket rather than from the wallet that supposedly had been stolen.

His time was enormously valuable to the country; his work was sensitive and often-required urgent decisions based upon first-hand examination of information to be found only in distant places

As he sat in the dimly lighted cabin of the fan-jet and watched the clouds racing below, Alexander wondered what his father and his uncles would say if they knew that his service to his country had often required him to issue kill orders

It wasn't much of a smile; it quivered on his lips as if sustaining it required more energy than lifting a hundred-pound weight

I had spent more time in useless development meetings than I had required to write both of those screenplays.