№58
1) things that impressed me the most about Amsterdam Public Library were the number (в значении "количество") of people who visited it and the fact that library contains not only books but also theatre, reader's cafe and exhibition space.
2) I imagine a comfortable space with cozy seats with endless amount of books.
№59
Libruk, E-bookua, Info-Library
№61
2) my father was washing the car.
3) my little sister and I were watching TV.
4) my elder sister was looking for her ring.
5) my two brothers were riding the bikes.