Adolescence /ˌæd

senior /ˈsiː.ni.ə r / /-njɚ/ adjective OLDER
1. [ before noun ] older
Senior pupils are expected to set an example to the younger children.
Compare junior
2. ( UK and Australian written abbreviation Snr , US written abbreviation Sr. ) used after a man's name to refer to the older of two people in the same family who have the same name
Hello, may I speak to Ken Griffey senior, please?
single-sex /ˌsɪŋ.gl ̩ˈseks/ adjective [ before noun ]
describes a school that is for either girls or boys, but not both
I went to a single-sex school.
studious /ˈstjuː.di.əs/ /ˈstuː-/ adjective LEARNING
1. describes someone who enjoys studying or spends a lot of time studying
She was a studious child, happiest when reading.
adopt /əˈdɒpt/ /-ˈdɑːpt/ verb TAKE CHILD
1. [ I or T ] to take another person's child into your own family and legally look after him or her as your own child
They've adopted a baby girl.
She had the child adopted (= She gave her baby to someone else to look after) .
They have no children of their own, but they're hoping to adopt.
Compare foster