Choose the correct options

1. The UAE has [deep|deeper|more deepest] sea near the beach than in Brazil, so you can have extreme diving with dangerous fish there.
2. Don't worry, the sea is [warm|more warm|warmer] than in many countries.
3. The UAE built [bigger|more bigger|bigest] islands than in other hot countries. There are so many kinds of entertainment there.
4. Water in the Amazon river in Brazil can be [colder|cold|more cold] than the sea.