Как правильно? chocolate is that? (who's, who, whose) we live in __ old flat in edinburgh. (the,a,an) what are your two names? ( sisters', sister's, sisters) my father teaches at a dchool in prague. (boy's, boys', boys)

1 whose

2 an

3 sisters'

4 boys'

___ chocolate is that? (who's, who, whose)

We live in __ old flat in Edinburgh. (the,a,an)

What are your two ___ names? ( sisters', sister's, sisters)

My father teaches at a ___ school in Prague. (boy's, boys', boys)