Commas in a series

Front

My friends are Mary, Joseph, (...) Diego.

Back

and

Front

I like to eat apples, pears, and bananas.

Back

,

Front

Rabbits can jump, run, and hop.

Back

,

Front

We saw snakes, lions(...) and monkeys.

Back

,

Front

My favorite colors: yellow, blue, pink.

Back

,

Front

Ducks can swim, walk, ...

Back

and

Front

He can swing(...) jump, and dance.

Back

,

Front

I played with Tom, Sally(...) and Willy.

Back

,

Front

She likes to sing, draw, (...) paint.

Back

and

Front

Tina plays tennis, volleyball, and tag.

Back

,