[ Tenses Usage ]
None of the renewable energy sources _____ completely free from environmental impact.
A. is
B. are
C. has been
D. have been
Random Topics:
Dependent PrepositionsApologizingTenses and Verb FormsGrammar - used toEs and SUnreal ConditionalsFuture - Will and Be going toTenses and ArticlesWill & Be going toComparatives, Superlatives, and ModalsOther quiz:
Tenses › ViewWe … play soccer every Saturday
A. was
B. were
C. are
D. will
Common Grammar Mistakes and Spelling Tips › View
For situations where you’re introducing information and need to give it some context or you have two directly related clauses and you want to emphasize the second one.
A. colon
B. semicolon
Vocabulary & Grammar › View‘Sorry. Did you say something?’
‘Yes, I asked you ________ me the salt.’
A. passed
B. to pass
C. please pass
D. passing
Grammar › View
Clive is the man ___ my cousin Lucy.
A. married
B. which married
C. who married