[ Passive Voice with Modal Verbs ]
. The problem ______ carefully.
A. should consider
B. should be considered
C. should be considering
D. should considered

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Infinitives for reasonsEmployment VocabularyGrammar - may/might/couldRelative PronounsPast Perfect TensePassive Voice and Relative ClausesGrammar-Verbs & Nouns Singular, Plural, GenderSimple Present Tense/be/Present ProgessiveGerunds, Infinitives and ParticiplesHave to/Has toOther quiz:
Connectives › ViewDo you have any brothers __________ sisters?
A. and
B. too
C. either
D. or
Mixed Tenses › View
Black ravens …… tourist every day
A. met
B. have met
C. are meeting
D. meet
Grammar › ViewThere ___________ some kittens in this box a few minutes ago.
A. is
B. are
C. was
D. were
Subject Verb Agreement › View
Two litters of gasoline ____ needed for this short trip.
A. are
B. is
