Вопрос по английскому языку:

Помогите!
Подставте правильние слова:
learning; deserted; motivational; treasured; concentrational

1. The successful businessman gave a ________ speech was realy inspiring.
2. I had a very short ______ span when i was younger.
3. This are the town is _____ at night and can be dangerous.
4 One of my most ____ memories os going for walks with my grandad down by the river.
5. People's _____ styles can change when they get older.