Question

For or since
They have been quarrelling ever....they got married
We were getting worried because he had been missing classes.....two weeks
I've earned my own living....I left school
He has been swimming under water....ten minutes
When he was young he was in prison....a year
Things have changed....I was a child

Answer 1

1)since
2)for
3)since
4)for
5)for
6)since

Answer 2

since
for
since
for
for
since