This the a subject about ___ we might argue for a long while.
A. that
B. what
C. which
D. it
He left his camera at home. You can use______.
A. I
B. me
C. mine
D. my
Answer ____ question carefully.
A. all the
B. enough
C. each
D. both
The woman made ___ her duty to look after all the helpless children in the village.
A. this
B. that
C. one
D. it