Topics: Modals
We __________ drop litter on beaches. It pollutes them.
A. mustn’t
B. can
C. should
D. must
Select your answer:

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Superlative AdjectivesConjunctions and PronounsPast or Present Verb TenseGrammar - used toGrammar: Parts and PunctuationSentence TransformationPresent Perfect ContinuousVerbs and PrepositionsModal Verbs in ConditionalsPossessive Adjective and PronounOther quiz:
Modals Tenses › ViewWere they able to get in touch with you by email?
A. CORRECT
B. INCORRECT
TOEFL › View
The horn of the rhinoceros consists of a cone of tight bundles of keratin ______________ from the epidermis.
A. grow
B. grows
C. growing
D. they grow
