[ Modal Verbs ]
Spectators…………_show their tickets before they enter My Dinh stadium.
A. must
B. have to
C. should
D. ought to

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Modals and PrepositionGrammar on ConditionalsTo Infinitive or Bare InfinitiveInterjections, Tag Questions and Nouns of Direct AddressSimple Past Tense & Future TenseGrammar - Present Perfect with already, just, yetTime ClausePassive Voice & TensesAdjective ending with ED & INGGrammar TOEFLOther quiz:
Prepositions › View_____ it is a nice day tomorrow, we can go swimming.
A. If
B. Until
C. When
D. Before
Similes and Body Idioms › View
Phei Qinn was calm and ____________ during the spelling quiz.
A. as cool as a cucumber
B. as tough as nails
C. as loud as thunder
D. as good as gold