Bài 1:  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)