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They use computers to keep the traffic _______ smoothly. 
#5026
A
being run
B
run
C
to run
D
running
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In 1963 we moved to New York,         my grandparents lived.
#4539
A
which
B
where
C
why
D
What
The collapse of the World Trade Centre  has put US economy in a difficult  ___________.
#4935
A
occasion
B
case
C
situation 
D
background
— Why are you so popular with your students?— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
#4683
A
as
B
that
C
if
D
which
—Sorry, do you mind if I smoke here? —Yes,            
#4877
A
you could
B
go ahead
C
I do
D
my pleasure
Wouldn’t it be       for you to pick me up at four o’clock and take me to the airport.
#4931
A
free
B
vacant
C
handy
D
convenient
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