[ Grammar ]
The use of reference books _____ necessary for learning a language.
A. is
B. are

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Adjective or AdverbPresent Perfect Simple vs ContinuousAcademic VocabularyTenses - AuxiliariesPresent Perfect and Present Perfect Progressive TensesGrammar & VocabTo Infinitive or Bare InfinitiveConditional Sentence Type 3PronounAdverbial ClausesOther quiz:
Grammar › ViewThe book or the pen ___ in the drawer
A. is
B. are
C. was
D. were
Modals › View
You _________ walk more.
A. should
B. can
C. have to
D. don’t have to
Adjective Clause › ViewWhat is the adjective phrase in this sentence? The cabin beside the lake was already occupied when we arrived.
A. When we arrived
B. Beside the lake
C. Was already occupied
Grammar › View
The food ___ by the chef.
A. is cooked
B. cooked
C. cooks
D. cooking