Good Riddles

Question: What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Question: I am a small room,
but no life lives inside,
no matter what weather looms,
very cold my residents reside.
What am I?

Question: No matter the shape I sit in, you'll find me in a row. Although my name has no letters, my initials are MNO. What am I?

Question: What runs around the house but doesn't move?

Question: The more you work, the more I'll eat.You keep me full, I'll keep you neat. What am I?