Plural of nouns

I can see two (fish) (a)   in the fish tank

How many (child) (a)   are there in the school yard?

We still need three more forks and (knife) (a)   for our dinner guests.

Sharks can grow thousands of (tooth) (a)   in a lifetime.

What is the population of Mexico? How many (person) (a)   live there?

Cats like to catch (mouse) (a)   .

There are lots of ducks and (goose) (a)   in this park

The policeman followed the three (man) (a)   out of the bank.

Many husbands and (wife) (a)   eat at restaurants on Valentine’s Day.

. (Wolf) (a)   look very much like large dogs