下列各句中，没有语病的一句是（ ）

Don’t be afraid of new words. You can in the dictionary.

The boys and girls were happily making a snowman, _______ with cold.

Time to go to bed, Mary.—-Oh, mum. I won’t go to bed _______ I finishes mycomposition.

Mary ________ a smile when she heard her family went to Australia without her.