Fill in the gaps with the comparative form of the adjectives given?

Fill in the gaps with the comparative form of the adjectives given. 1. A rock is than a leaf. (heavy) 2. Our house is than yours. (big) 3. The princess is than the witch. (beautiful) 4. Tom is a student than Mary. (good) 5. Bicycles are than motorbikes. (safe) 6. July is than January. (hot) 7. A lion is than a cat. (dangerous) 8. Helen is than Mary. (happy) 9. Computers are than telephones. (expensive) 10. I think golf is than football. (boring) surpe urgente.