1: Cathy is trustwortht. She's a person upon....... You can always depend.
A: who
B: whom
C: that
D: o
2: Mr. Donaldson,.......... Teaches linguistics at the university, recently received recognition for her research
A: who
B: whom
C: which
D: that
3: the earth,..... Is the fifth largest planet in the solar ststem, is the third planet from the sun
A : who
B: whom
C: which
D: that
4: she is one of the few people to........ I look up
A: who
B:whom
C:that
D: o