I failed in the job interview and only then _____ the importance of learning English well. 
#82014
A
I realized
B
I had realized
C
did I realize
D
had I realized
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  Only at that time ______ that he had made a lot of mistakes in his homework.
#83971
A
He realized  
B
did he realize
C
he did realized
D
realized he
.Only when your identity has been checked ________.
#80677
A
you are allowed in
B
you will be allowed in
C
will you allow in
D
will you be allowed in
_______ that Marie was able to set up new branches elsewhere.
#84491
A
So successful her business was
B
So successful was her business
C
So her business was successful
D
So was her successful business
Only by working hard        succeed.
#82479
A
can you
B
you can
C
could you
D
you could
While ______ in Scotland, he made friends with the natives there.
#81968
A
working
B
worked
C
he works
D
he is working