[ Grammar ]
Those audiences ____ show their tickets before entering the concert hall.
A. have to
B. must
C. ought to
D. don’t have to

Random Topics:
Grammar - FragmentsRelative Clauses and Past PerfectSentence LabelingRun-On SentencesNouns, Articles, DeterminersPresent Simple and Present Continuous TensesGrammar / PronounsInfinitives or GerundsVerb BETenses and Word FormationOther quiz:
Modal Verbs › ViewWhich modal verb is used to express a strong recommendation or obligation?
A. should
B. can
C. might
D. must
Grammar › View
violent events that are outside the control of humans
A. dividend
B. divisor
C. natural disaster
D. idiom
Modal Verbs › ViewJohn ________ your car keys. He hasn’t even left the house.
A. can’t take
B. mustn’t take
C. can’t have taken
Tenses › View
When talking about a completed event where an exact time is given or is obvious, we use:
A. Present continuous
B. Past continuous
C. Present simple
D. Past simple