– Can you come to my birthday party? – I’m sorry, ______ I can’t come.  
#55933
A
and
B
but
C
or
D
then
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This problem is ______ difficult __________.
#57835
A
so; that few of us can do
B
so; that few of us can do it
C
too; for anyone of us to do
D
too; for anyone of us to do it
Grace Brown __________ play tennis every day.
#58071
A
isn‘t
B
don’t
C
aren’t
D
doesn’t.
Nothing can be done _______  he returns.
#56142
A
as
B
before
C
while
D
until