Select your answer:

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Present Perfect Tense or Present Perfect Continuous TenseLinking Words and ConjunctionVerb Tenses and ModalsTenses and Word FormationVocabulary & GrammarVocabulary & Phrasal VerbPast Tense, Recount Text, and Future TenseNounGrammar MistakesMuch, many, a lot of, a few, a littleOther quiz:
Gerunds and Infinitives › ViewIt’s important to practice ………. a healthy lifestyle.
A. maintain
B. to maintain
C. maintaining
D. maintained
E. maintenance
Vocabulary › View
A method for collecting information by observing a phenomenon in action.
A. variability
B. observational study
C. quantitative data
D. categorical data
