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“The impact will only grow     Iran’s leaders decide to change course and meet their international obligations,” US Secretary of State Clinton warned．
#32377
A
in case that
B
provided that
C
unless
D
until
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______ you understand the rule, you can do it well.
#79900
A
For
B
As
C
Once
D
While
Many in the company doubted whether the new product could bring in ____ those sold.
#34292
A
as good as
B
as well as
C
as much as
D
as many as
I’ll just call Steven to remind him _____ we are meeting at eight.
#32118
A
that
B
which
C
what
D
of
I had been looking for the book for two days _______ I found it at last.
#30963
A
until
B
when
C
while
D
before
There is plenty of rain in the southeast,         there is little in the northwest.
#31678
A
because
B
therefore
C
while
D
as