[ Grammar ]
Mary was so cold that her teeth started ………. .
A. chattering
B. shaking
C. moving
D. knocking

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Synonyms and VocabularyGrammar - may & mightGerunds as Objects of PrepositionsCommasQuestion tag and + - AgreementCoherent Sentence with Correct Grammar StructureThe First Conditional (if/unless)Grammar - Nouns, Verbs, and AdjectivesAbstract NounsAdverbial Clause, Noun ClauseOther quiz:
Grammar › ViewTodd ___ Mr. Chen write the dos and don’ts for the library when(當……時)everybody had lunch in the classroom.
A. helps
B. helped
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Grammar › View
Where are my ____________________?
A. pins
B. pen
C. pens
D. pin