Q: country : mexico - espanol
A: Country : Mexico - espanol

Q: there are self-service bag drops at helsinki and oulu airports.
A: There are Self-service Bag Drops at Helsinki and Oulu airports.

Q: it is not quite clear what the distance l(0) reflects concerning the mass m0.
A: It is not quite clear what the distance l(0) reflects concerning the mass m0.

Q: they had five children; one of their sons sergei novikov was awarded a fields medal in 1970.
A:
They had five children; one of their sons Sergei Novikov was awarded a Fields Medal in 1970.