[ Tenses Usage ]
None of the renewable energy sources _____ completely free from environmental impact.
A. is
B. are
C. has been
D. have been
Select your answer:
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like/do not likeGrammar - too & enoughModals for RecommendationsGerunds as Objects of PrepositionsPresent Tenses and VocabularyQuantifiers & Modal VerbsCollective NounsPast Perfect Simple TenseThe Past Simple
Other quiz:
Tenses › ViewBryan _________ in the rock band since he won the first price at the Teen Choise Award.
A. being
B. was
C. is
D. has been
Modal Verbs › View
He owns a huge mansion and three fancy cars. He ____ be embarrassingly rich.
A. should
B. ought to
C. needs to
D. must
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