[ Modal Verbs ]
You ___________ keep quiet when you are in a library.
A. Shouldn’t
B. Can
C. Must
D. Could
Select your answer:
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Grammar and SyntaxBASIC GRAMMAR - PRONOUNSGive, do and makePossessive Pronouns and Adjective PronounsIdiomsMust Vs Have toPhrasal Verb & Prepositional PhraseState Verbs and Action VerbsPresent / Future / Present Progressive / non Action VerbsQuantifierOther quiz:
Relative Clauses › ViewI hope the police will catch the thief __________ stole your wallet.
A. who
B. whom
C. which
D. whose
Grammar for TOEFL › View
Potassium has a valence of positive one because it usually loses one electron when _____ with other elements.
A. does it combine
B. it combines
C. in combining
D. combination