Ответ:
1 A twin has a sister or brother with the same birth date.
2 An orphan is a child with no parents.
3 When you finish university you are a graduate.
4 After you retire, you become a pensioner and get money from the government.
5 A toddler is a child between two and four.
6 An infant is a child in its first year.
7 A tween is a child who is not yet a teenager.
