[ Grammar and Idioms ]
What is the opposite of “mandatory”?
A. Required
B. Optional
C. Necessary
D. Compulsory

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Mixed General Quiz › ViewAlso, ___ Memorial da America Latina, a huge cultural space designed by the Brazilian architect Oscar Niemayer to promote Latin American cultural integration.
a. not miss
b. don’t miss
c. can’t miss
d. shouldn’t miss
Passive Voice › View
References _________ in the examination room.
A. not are used
B. is not used
C. didn’t used
D. are not used
Vocabulary › ViewPolitical candidates who do nothing but ___ their opponents’ character and abilities may alienate voters.
A. deride
B. ingenuous
C. decrepit
D. revel
Past Tenses › View
They _______ (arrived/was arriving) at the airport when the flight _______ (departed/had departed).
A. arrived/had arriving
B. had arrived/departed
C. Was arriving/departed
