[ Grammar ]
A strange thing _____ while we were waiting.
A. happens
B. happened
C. happening
D. happen

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Grammar - Verb FormsModals and Past TensesPronouns, Sentence Structure, and ApostrophesA/AnTypes of Sentence StructuresThe Structural Types of SentencesPassive Voice & TensesAdjective / Noun + to InfinitivePassive VoicesVerb PhrasesOther quiz:
Grammar › View. Which of the following words is a noun?
A. Run
B. Beautiful
C. Happiness
D. Quickly
Grammar › View
You ___ call your parents and tell them where you are.
A. should
B. mustn’t
C. can’t
D. can
