—Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?—No, but scientists are working to develop ________ .
#16397
A
that
B
it
C
one
D
so
推荐题目
—Can I help you, boy?—Yes. There is ______ wrong with my bike.
#57716
A
something
B
anything
C
everything
D
nothing
_____ of the family isn’t willing to give up the chance to watch the exciting match.
#16277
A
Any
B
Everybody
C
All
D
Every one
．No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
#16908
A
which
B
what
C
it
D
they
—What do you think of the price of these computers?—They are at least equal in price to, if not cheaper than, ________ in other companies.
#15121
A
it
B
ones
C
that
D
the ones
—Is there any possibility you could pick me up at the airport ?—No problem
#17192
A
when
B
that
C
whether
D
what