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)
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