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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—We weren’t sure which way to go. In the end we turned right.—You _____ the wrong way. You _____ left.
#4836
A
went; should have turned
B
have gone; must turn
C
went; would have turned
D
had gone; must have turned
Evidence obtained from observation and experiment is often used to _____ a scientific theory.
#4841
A
confirm
B
confine
C
conform
D
conceive
_________ the flight to New York will be delayed is _________ I’m especially worried about.
#4625
A
If; what
B
Whether; that
C
When; that
D
Whether; what
—I think languages subjects are more interesting than science ones. —________. I prefer science subjects.
#4579
A
It’s up to you
B
That’s all right
C
I can’t agree more
D
I don’t think so
The sunlight came in____________ the windows in the roof and lit up the whole room.
#4833
A
through
B
across
C
by hour
D
each hour