Thisistheboywithout________helpIcouldn’thavepassedthatdifficultexam.
A. who
B. whom
C. whose
D. that
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Thisisthefactory________wevisitedtheotherday.
A. where
B. inwhich
C. there
D. /
Therearemanythingsindifferentareas________wecandotoreducethepossibledangersofAIDS.
A. where
B. there
C. what
D. that
Theengineer________myfatherworksisabout60yearsold.
A. towhom
B. onwhom
C. withwhich
D. withwhom幻灯片32
Hehastwosons,________workaschemists.
A. twoofwhom
B. bothofwhom
C. bothofwhich
D. allofwhom