a group of related plants or animals
A. composition
B. class
C. characteristic
D. vary

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Article the or zero article (-)Conditional Sentences Type 1Correlative Conjunction & Complex SentencesGerunds as objects of prepositionGrammar: MorphologyPresent Simple, Present Continuous or Present PerfectSimple Past ContinuosDo not or Does notConjunctions and Sequence ConnectorsAdjectives and comparisonsOther quiz:
Grammar › ViewIt isn’t necessary for you to review your entire grammar book.
A. You shouldn’t review your entire book.
B. You’d better not review your entire book.
C. You can’t review your entire book.
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A. more difficult
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A herd of elephants was moving towards the lake.
A. Special Noun
B. Compound Noun
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………………… (you, lock, always) the door to your apartment when you leave?
A. Does you always lock
B. Do you always lock
C. Do you lock always
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