[ Grammar ]
I have no idea ____ left the lights on all night.
A. Who
B. Whom
C. Whose

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How often - long - much - manyVerb + InfinitivePrepositions after Verbs and AdjectiveModal Verbs and Contrastive ConjunctionsPresent Simple & Present Continuous TensesPRESENT SIMPLE vs PRESENT CONTINUOUS + QUANTFuture Perfect TenseAdverbSentence CompletionGrammar speak,talk,say,tellOther quiz:
Grammar › ViewThe school _____________ was damaged during the flood is still closed.
A. who
B. whom
C. which
D. that
Conditionals and Modals of Probability › View
Unless you ____ louder, your classmates won’t understand you.
A. didn’t speak
B. had spoken
C. don’t speak
D. speak