No one knows exactly when our ancestors started talking,but new evidence suggests  _______might have happened a long time ago.
#4852
A
which
B
what
C
it
D
they
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The classroom is big enough        , but we’ll have to move if we have more students. 
#4914
A
for the moment
B
on the moment
C
in a moment
D
for a moment
Written in a hurry,          How can it be satisfactory?
#4564
A
they found many mistakes in the report.
B
Sam made lots of mistakes in the report.
C
there are plenty of mistakes in the report.
D
the report is full of mistakes.
Is this the reason__________at the meeting for his carelessness in his work?
#4971
A
he explained
B
what he explained
C
how he explained
D
why he explained