[ Grammar ]
Great numbers of tiny shelled animals ………….. on the ocean floor.
A. live
B. living
C. they will live
D. if they lived

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First ConditionalAdverbs of How Something is DoneSo or SuchArticles and QuantifiersGrammar (Adverbs, Prepositions, Prepositional Phrases)Phrasal Verb and ModalDo / Have / Can - Basic QuestionsAction vs Linking Verbs/ Verb PhrasesVerb FormsInfinitivesOther quiz:
Tenses › ViewI shall walk to the theatre unless it _____ heavily.
A. was raining
B. will rain
C. would rain
D. rains
E. rained
Idioms › View
Don’t you think we should go ___ our plans again?
a. down
b. through
c. on