[ Vocabulary ]
The cost of producing one more unit of a good
A. Interest
B. Productivity
C. Marginal
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Vocabulary › Viewa category or type of literature or art characterized by similarities in form, style, and subject
A. genre
B. story
C. myth
D. drama
Vocabulary › View
What does the word vaccine mean?
A. medicine to prevent a disease
B. a medicine substitute that has no value
C. a medicine or remedy for a disease
D. tacky or tastelessly showy
Tenses › ViewThe boys __________________ in the garden when they __________________ their father’s steps. (WORK, HEAR)
A. had worked – heard
B. were working – heard
C. had been working – heard
D. are working – heard
Article › View
He eats …apple daily.
A. A
B. The
C. An
D. X