Is the noun singular or plural?

Did the men examine the fossil at the museum?

The goose defended the nest from predators.

Many animals have claws on their feet.

The playful child laughed and ran to the swing.

The gentlemen entered the room and talked quietly.

It will be expensive to fix the roofs.

The hotel owner bought a cat to scare the mice away.

The person in the green shirt is looking for her bag.

Where did the woman buy the material for the dress?

The expert studied the dinosaur tooth to learn what it ate.

Mr. Wilson transferred all the sheep to the other paddock.

Summer saw a dozen deer, all grazing on the grass.

The children had a wonderful time at the fair.