[ Grammar ]
It is our responsibility to ________ our planet’s ecosystems.
A. preserve
B. preservation
C. preserving
D. preserver

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Contrastive ConjunctionRelative Pronouns with PrepositionsAdverbial Clauses of Reason / CauseGrammar - Present Perfect with already, just, yetVocabulary, Grammar, SpellingVerb & GrammarTo Infinitive/Bare Infinitive/GerundsMixed TensesConjunctionwill, be going to, would like toOther quiz:
Vocabulary › Viewan explanation for why something happens based on evidence
A. catastrophe
B. evidence
C. conclude
D. theory
Tenses › View
When she _______________ (get) home, she _______________ (find) that her cat had disappeared.
A. gets / finds
B. got / had found
C. had gotten / found
D. got / found
Grammar › ViewThere used __________ a stadium here, but it closed a long time ago.
A. be
B. to be
C. been
D. being
Grammar › View
Liz ___________ play her guitar 2 months ago, but now she can play it well.
A. couldn’t
B. could
C. can’t
