[ Modals Posibility and Probability ]
I don’t know the answer. It __________ be a, b, or c.
A. must
B. can’t
C. might
D. could

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Future Perfect TenseModals and Active and Passive VoiceUnless If First ConditionalNouns, Articles, DeterminersModals TensesInfinitive GerundContinuous TensesConjunctions in Complex SentencesModal Verbs - ObligationLinking Verbs & Helping VerbsOther quiz:
Grammar › ViewThere is no need to ….. over the cracks, I know you are having problems, just tell me and I will help you.
A. carpet
B. paper
C. lay
D. curtain
Tenses › View
A: Do you know where John is?
B: I … John this week.
A. have not seen
B. don’t know
C. didn’t know
D. haven’t saw
E. hasn’t seen