____ dark was the night that we had to rely on our ears instead of our eyes.
A. How
B. Very
C. Extremely
D. So
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____ did he realize that he had made a mistake.
A. Upon entering the classroom
B. Only after entering the classroom
C. After he had entered the classroom
D. As soon as he entered the classroom
It was not until she had arrived home ____ her appointment with the doctor.
A. did she remember
B. that she remembered
C. when she remembered
D. had she remembered
It was the date_____they went abroad.
A. when
B. which
C. that
D. on that
It’s only through practice ____ one will be able to swim skillfully.
A. what
B. who
C. that
D. which
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