Question

Как правильно писать? 
His sister (didn't finish/hasn't finished) school yet
I (haven't seen/didn't see) Tom today
(Have you met/did you meet) before?
Yes, we(have met/met) once. It (was/ has been) in Spain 

Answer 1

His sister hasn't finished school yet
I haven't seen...
Have you met before?
Yes,we have met once. It was in Spain

Answer 2

1-hasnt finished 2-havnt see 3-did you been 4-have met и has been