Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
#4678
A
producing
B
having been produced
C
to be produced
D
produced
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The winter of 2008 was extremely bad. most of people say it was the worst winter of their lives.
#4911
A
In general
B
In a word
C
In all
D
In fact
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
The task is too much for me, so I can’t carry on ______any longer. I must get some help.
#4922
A
singly
B
simply
C
alone
D
lonely
Richard was called in by the police to answer questions _______ the disappearance of Thomas Ripley, whose relatives were so ______ his present situation.
#4655
A
concerning; concerned about
B
concerned; worrying about
C
with regards to; concerned
D
regarding; concerning about
______ that he runs the fastest in his class.
#4553
A
It is no doubt
B
It is doubtless
C
There is no doubt
D
I don’t doubt about