6.The man____came here this morning is my brother.
a.what
b.when
c.whom
d.who

7.The tree of____the leaves are yellow is dying.
a.what
b.when
c.which
d.who

10.It is Sunday___Tom has his piano lesson.
a.what
b.when
c.whom
d.who

12.he said.____I don't believe in
a.what
b.when
c.whom
d.who

13.Ple..ase show me___to take a picture.
a.what
b.when
c.whom
d.how

14.A singer will teach us____to sing the songs sweetly.
a.how
b.when
c.whom
d.who

15.I talk to.____That is the girl
a.what
b.when
c.whom
d.who​