[ Vocabulary ]
We need to be _________ of enviromental problems so that we can find ways to protect nature.
A. aware
B. calm
C. kind
D. willing

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Verbs, Tenses, and VocabularyPassive Voice, Question Tag, PrepositionsModal Verbs & Time PrepositionsPresent Tense (Negatives and Questions)Present and Past Simple TenseModals and Present TensesDemonstrative PronounPronoun & Present SimpleSo....that... Such.......thatSimple Past Irregular & NegativeOther quiz:
Grammar › ViewMinerals that are very ………. like diamonds and rubies are usually very expensive.
A. succint
B. ascertain
C. scarce
D. superior
Interrogative Pronouns › View
——– is your favorite sports ?
A. what
B. who
C. which