What is the antecedent?

Mrs. Johnson asked Robert to help catch her dog.

The car has a leak in its transmission.

Wearing a hat when it snows is wise.

The audience applauded her performance.

The audience clapped its hands.

During the winter, sparrows depend on our feeder for their food.

Mr. Jones awarded the prize to Bill; he will go on to Washington next month.

The rain continued to fall, and the mud grew deeper until it finally stopped.

Someone from the circus led the horse out of the ring.

The boy wore his yellow raincoat.