Fill in the blanks with suitable prepositions:
Child labour takes place when children are forced ______ work _____ an age when they are expected to study and enjoy their phase _____ innocence. It implies lost or deprived childhood that leads to exploitation of children _____ various forms.
1
to, at, of, in
2
at, in, of, in
3
in, at, off, on
4
on, in, of, at