1. My mum thinks that cats are ___________ (intelligent) pets than dogs. 2. Cycling is one of ___________ (dangerous) sports. 3. Bicycles are ___________ (slow) than cars. 4. She is ___________ (nice) person I know. 5. Glass bottles are ___________ (good) than plastic bottles. 6. I think Rafael Nadal is ___________(good) tennis player in Spain.