While ___________ agencies of socialisation are predominantly important in infancy, __________ agencies of socialization also become important in early childhood.

The correct answer is primary; secondary.

1. Understanding Primary Agencies of Socialisation:
Socialisation begins at birth. During infancy, an individual's immediate family and parents serve as the primary agency of socialisation. Infants acquire basic habits, emotional bonds, language, and foundational values within the home environment. Because the family has the earliest and most profound impact on a child's initial development, it is classified as a primary agency.

2. Understanding Secondary Agencies of Socialisation:
As a child transitions into early childhood (around ages 3 to 6 years), their social world expands beyond the home. They start interacting with secondary agencies of socialisation, such as preschools, neighborhood peers, daycares, and media. These institutions introduce the child to broader societal norms, rules, cooperation, and group behaviors outside the family setting.

Conclusion:
Therefore, while primary agencies of socialisation are predominantly important in infancy, secondary agencies of socialization also become important in early childhood.