[ Passive Voice with Modals ]
Electronic devices ______ recycled at special centers.
A. can be
B. must be
C. may be
D. should be
Select your answer:

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Definite & Indefinite Pronoun & ConditionalsAuxiliary Verbs (be, do, have)Reported Speech and TensesSentence TypesComparisonGerunds as objects of prepositionConditional SentencesVocabularySimple Tenses in EnglishIndependent/Dependent Clauses & Relative ClausesOther quiz:
Modal Verbs › ViewFill in the gap: “To finish with the rules, you ______ clean up after yourself.”
A. might
B. should
C. must
D. may
Prepositions of Place › View
The two pictures are right _____ the bed.
A. on
B. in
C. under
D. beside