Mother : Where do you keep the keys?Do you put them here? Father : I think I put them here,but...I think they could be in my leather jacket. a.I'm sure b.I'm ce

Mother : Where do you keep
the keys?Do you put
them here?
Father : I think I put them
here,but...I think they
could be in my
leather jacket.
a.I'm sure
b.I'm certain
c.I'm no doubtful
d.I'm not certain