QUESTION: Fix punctuation: As a student I attended their courses and seminars and was introduced in an unusually personal way to the world of mathematics
ANS: As a student I attended their courses and seminars and was introduced in an unusually personal way to the world of mathematics.

QUESTION: Fix punctuation: Restaurant krydderiet i open for a la carte Monday Saturday for lunch 1230 1600 and for dinner 1800 2220
ANS: Restaurant krydderiet i open for a la carte Monday Saturday for lunch 12.30 16.00 and for dinner 18.00 22.20.

QUESTION: Fix punctuation: Register Check your email and register through the link we sent you
ANS: Register Check your email and register through the link we sent you.

QUESTION: Fix punctuation: To the north is Collserola Park Originally the centre of this district was the Vila dHorta and gradually grew with the urbanization of the area
ANS:
To the north is Collserola Park. Originally, the centre of this district was the Vila d'Horta and gradually grew with the urbanization of the area.