用所给词的正确形式填空。
1. My hands are ___________ (small) than his hands.
2. My pencil is shorter than ___________ (you).
3. His head is ___________ (big) than Li Ping's.
4. The dog is ___________ (heavy) than the cat.
5. My bedroom is on the ___________ (one) floor.
1. smaller 2. yours 3. bigger 4. heavier 5. first