5. Choose the correct words and read the sentences.
1. (Since/because) Rus was rich in forests, people made their houses of wood.
2. The frog gave Prince Ivan his arrow, (so/as) he kept his promise and married it.
3. (As/because) Russian people believed in wonders, the heroes of their tales had wonderful adventures.
4. The Snow Maiden was afraid of jumping over the fire (so/because) she was made of snow.