Question

1._____is Mr Black?He's a doctor.A.Whose B.What C.Who

2.Whose bedroom is it?Perhaps it's the____.Atwin B.twins' C.twins's
3.___ballpen is here.Where is____?A.My;your B.Mine;yours C.My;yours

Answer 1

1, What 问职业用what is
2， twins' 复数直接在s后加 ’ 就行
3, my , yours (yours 是名词性物主代词）