Scientists photographed for the first time ever _____ wild gorillas used a stick to test the depth of a pool before getting into it, according to a recent study.
#59036
A
which
B
what
C
that
D
when
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Though ____money, his parents managed to send him to university.
#5035
A
lacked
B
lacking of
C
lacking
D
lacked in
Mike’s father, as well as his mother, commanded that he _____ home.
#4565
A
stayed
B
could stay
C
stay
D
has stayed
I thought Jim would say something about his school report, but he ______ it. 
#4948
A
doesn’t mention
B
hadn’t mentioned
C
didn’t mention
D
hasn’t mentioned