6. Fill in the gaps:
1) The elephant is the ... (big) land animal.
2) Monkeys are ... (sociable) than giraffes.
3) These baby monkeys are ... (curious) than those ones.
4) A dog is a man's ... (good) friend.
5) I think dolphines are the ... (clever) animals in the world.
6) Horses are ... (beautiful) than camels.