[ Subject-Verb Agreement ]
The actors and the director (understands, understand) the lighting problems.
A. Understands
B. Understand

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Future Continuous, Future Perfect and Future Perfect ContinuousGrammar : Must (Necessity)Gerund & Participlemust/shouldGrammar - TOEICGrammar SuffixesFuture Simple TensePast ParticiplesGrammar: MorphologySuperlative & Comparative AdverbsOther quiz:
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A. cook
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Past of read
A. read
B. readed
C. readen