6.The fact________she works hard is well known to us all.
A.that B.what C.why D.which
7.The mountain is no longer________it used to be.
A.which B.that C.as D.what
8.We know little about the young lady except________you told me.
A.what B.that C.how D.不填
9.I know nothing about her except________she is from Canada.
A.how B.when C.that D.why