[ Modal Verbs ]
People living in high-rise buildings _____ obey the safety rules and regulations strictly.
A. shouldn’t
B. mustn’t
C. may
D. have to

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Grammar TOEFLDemonstrative Pronouns and Verb TensesAdverb or AdjectiveGrammar - Wh QuestionsGrammar and Sentence CorrectionComparative and Superlative AdjectivePresent Perfect Simple & ContinuousPresent PerfectPresent Perfect Simple & Present Perfect ContinuousPronouns/ Present TenseOther quiz:
Coordinate Conjunction › ViewThe candidate didn’t show up for the interview, … the HR manager crossed her off the list.
- and
- but
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Comparatives ( adj/ adv) › View
The air in the mountainous zones is ______ than that in the cities.
A. more fresh
B. fresher
C. more fresher
D. freshly