[ Cardiology Services ]
The structure that prevents the backflow of blood in the heart is known as the____________.
A. septum
B. mediastinum
C. valve
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ConditionalSubject Verb Agreement and Coordinating ConjunctionsSecond ConditionalWas & Were QuestionsAuxiliary Verbs & Question TagsPersonal Pronouns and VerbGerunds as Objects of PrepositionsMix-TensesGrammar - Capitalization and Possessive NounsVocabulary Spelling GrammarOther quiz:
Grammar TOEFL › ViewHaving switched off the light,_____
A. it was the door he locked.
B. he locked the door.
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Don’t jump _____ the pool. The water isn’t deep.
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Identify the part of speech of the underlined word.
The best breakfast in town!
___
A. Noun
B. Pronoun
C. Verb
D. Adverb
E. Adjective