Read and choose the correct answers.

Whales (12) __________ the biggest animals in the world. And they are the largest animals that live in the sea. They are (13) __________ than elephants. There are many different families of whales. Blue whales are the biggest. (14) __________ can be more than 100 feet (∼ 30,5 metres) long. Whales live in families. They (15) __________ in the sea and find food there. Whales are not dangerous, (16) __________ people are often afraid of them because they are so big.