True or false. Student's book p.84 ; grammar

Many years ago it was hot in the north of the world.

The people in the countries in the north were often hungry.

The dragon attacked only animals.

The Vikings were sailors.

The old men were talking about the Vikings.

Magnus saw flames in the sky.

The Vikings wanted to find richer lands ___ they went on long voyages.

Magnus couldn't leave home ___ his father needed help.

They didn't have enough food ___ they suffered.

The Vikings were going on a voyage ___ they were preparing their longboats.

The dragon started attacking people ___ there was no other food.

Magnus heard a very loud noise ___ he looked up.