This is the 1000th most frequent French word.
bonnes
"Bonnes" means "good" (feminine plural form).
Here, 'bonnes' functions as an adjective agreeing in gender and number with 'réponses' to mean 'correct' or 'good' depending on the context.
Les bonnes réponses ont été données.
The correct answers have been given.
In this sentence, 'bonnes' modifies 'lectures' to indicate they are suitable or appropriate for children.
Ces livres sont de bonnes lectures pour les enfants.
These books are good readings for children.
Here, 'bonnes' describes 'surprises' and suggests that the surprises were pleasant or favorable.