Complete the sentences using the correct word from the box.
so, since, because, as
1._______________ Ivan wanted to build a flying ship, he went to the forest
to try his luck.
2. Ivan didn’t have any dinner to eat, _________________his mother gave him
only a piece of stale bread.
3. Ivan was polite with the old man _______________ he decided to help
the young man to build the ship.
4. Ivan quickly built the flying ship ________________he followed the
advice of the old man.
5. ____________the old man helped Ivan, he promised to take on
the ship all people he saw on his way.