[ Passive Voice with Modals ]
Recyclable materials ______ separated into categories.
A. can be
B. must be
C. may be
D. should be

Random Topics:
Verb Tenses and Sentence StructureComparison of Adjective and AdverbAdverbs and PhrasesModifiersPresent Perfect and Present Perfect Progressive Tenses“Put” Phrasal VerbPassive Voice with ModalsPast Tense vs Present TensePast Simple or Past ContinuousSentence TypesOther quiz:
Grammar › ViewThe car alarm has been going off for ages! I _______ someone _______ turn it off.
A. wish, will
B. wish, would
C. had, will
D. had, would
Vocabulary › View
laud
A. to improve
B. to praise
C. permanent
D. fraud
Present Simple › ViewBill and Calicia _______ to the mountains every year.
A. doesn’t drive
B. doesn’t drives
C. don’t drive
D. don’t drives
Idioms › View
Curiosity killed the
A. cat.
B. dog.
C. rabbit.
