[ Pronouns ]
I heard someone at the door but wasn’t sure __________ it was.
A. what
B. which
C. whom

Random Topics:
Gerund, Infinitive, Bare VerbIntermediate GrammarGrammar - Verb FormsVerb ConjugationInfinitiveGRAMMAR - Could / Could notVerbals and GerundsGrammar on ConditionalsConjunctive Adverbs and PunctuationPresent Perfect Simple & Present Perfect ContinuousOther quiz:
Comparision › ViewPeople in the North of the UK live______ people in the South.
A. longer than
B. the longest
C. the longer
D. longest
Vocabulary › View
Which word means “to enjoy oneself in a lively and noisy way, especially with drinking and dancing”?
A. revel
B. rhapsodize
C. sepulcher
Grammar › View“Yeah, I’ve been to Greece.”. My friend told me that he ________ to Greece.
A. been
B. had been
C. was
Vocabulary › View
More than a billion people all over the world are under the threat of desert .
A. ncrease
B. expansion
C. development
D. extension