A. condition
B. requirement
C. certificate
D. ability
A. vacant
B. vacantly
C. vacancy
D. vacancies
A. absence
B. remembrance
C. behalf
D. reminder
A. obligatory
B. mandatory
C. obliging
D. optional
A. hardly
B. hard
C. completely
D. scarcely
A. it was difficult for me to understand
B. I still couldn't understand its main idea
C. the main idea of it was not clear to me
D. it made me confused about its main idea
A. Why don't
B. Why should
C. What should
D. What must
A. didn't need to wait
B. mustn't wait
C. needn't have waited
D. needn't wait
A. lost
B. ’ll lose
C. lose
D. would lose
A. was
B. were
C. would be
D. had been
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