[ 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 › ViewIt was the first time he ____ anything so melodious.
A. had been hearing
B. was hearing
C. has heard
D. had heard
Grammar › View
I’m very interested _____ learning languages.Â
A. in
B. at
C. about
D. for
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.
