Scientists will break ___ in their search for new sources of energy.
Regular VerbVocabularyGood vs. Well Wish + Verb 2Grammar - Imperatives and LetPast simple - Irregular VerbsGrammar Past and Future TenseSuperlative AdjectivesGrammar (Adverbs, Prepositions, Prepositional Phrases)
Other quiz: Grammar
My dog usually _______________ when he sees a cat.
C. is barking
D. are barking
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