[ Grammar and Idioms ]
What is the opposite of “mandatory”?
A. Required
B. Optional
C. Necessary
D. Compulsory
Random Topics:
Give, do and makeSimple and Past TensesModal Verbs and ConditionalsModals: Possibility, Necessity, ExpectationComparative AdverbsAlong & AgainstState Verbs and Action VerbsPerfect Tenses of VerbsGerund and InfinitiveVerbals and GerundsOther quiz:
Grammar › ViewMy grandfather was born ___ Oct.10th，1935.
A. on
B. in
C. at
D. of
Vocabulary › View
What is the inner layer of the Sun’s atompshere, located above the photosphere and below the corona?
A. Corona
B. Photosphere
C. Chromosphere
D. Blazar
Political 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