Put the adj in parentheses in correct form of comparison

Put the adj in parentheses in correct form of comparison.
1. A text- book is (interesting)………than a novel.
2. An elephant is (heavy)……………..than a cat.
3. The Mekong river is (long)….than the Red river.
4. February is (short)………...month of the year.
5. Bac is (strong)…………..…..Nam.
6. Nam is (big)………………..…..Tö.
7. My sister is (beautiful)…………his daughter.
8. Your motorcycle is (expensive)…………mine.
9. This desk is (heavy)…………...that table.
10. This book is (good)……………….that one.
11. Lan is (clever)………….….your sister.
12. The pacific is (large)…….…ocean in the world.
13. Nam is (noisy)……………student of all.
14. A dog is (strong)……………than a horse.
15. Which is (good)……..…..novel on the shelf?