A: Suddenly she fell down unconscious.
B: Maria has always liked sports and she wanted to study sport at university.
A: However, she'll never forget her lucky accident.
B: Ski experts were coming to watch the competition and choose the best skiers.
A: However , operation on the heart are extremely dangerours and Maria might not survive.
B: Maria had to ski into the trees to avoid her and she hit her head hard on a tree.