下列各句中，没有语病的一项是（ ）

What a shame that there are so many people there, but ______ dare stop the crime(违法、犯罪行为).

Mom, this is my friend, Bob. — ___________

Must I come back before supper, mum—No, you.

The birds that will spend the whole winter here have been digging holes in the snow _______ from the cold weather.