Not until I got to the airport____ that my passport was missing.
A. had I realized
B. will I realize
C. I will realize
D. I had realized
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As a salesperon,____John lacks is self-confidence when he is talking with clients.
A. which
B. what
C. why
D. that
If I____his email address,I would have sent him a message yesterday.
A. have known
B. had known
C. will know
D. know
The more satisfied your employees are, the more they will contribute____the success of your company.
A. on
B. about
C. with
D. to
He read my credit card number out loud in front of customers____I could stop him.
A. before
B. while
C. as
D. since