[ 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 › ViewChoose the word with a different sound.
A. choose
B. could
C. would
D. look
Grammar › View
It is reported ____ in the accident.
A. that two people were injured
B. that two people to be injured
C. that two people injured
D. to two people be injured
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