[ Gerund and Infinitives ]
It’s essential for every citizen to consider __________ to environmental conservation.
A. contributing
B. to contribute
C. contribute
D. to contributing

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ModifiersPresent Perfect and Past SimplePresent Progressive TenseGrammar: Defining Relative ClausesDefinite vs Zero Article Abstract NounsArticle the or zero article (-)Present Forms and Narrative TensesTenses and Verb FormsWish, Unless, If sentenceModals of AdviceOther quiz:
Vocabulary › Viewa severe shortage of food over a large area
A. appeal
B. expand
C. prey
D. famine
Adverbial Clauses › View
______ his motorbike, he found a puncture on the back tire.
A. After he has washed
B. While he is washing
C. As soon as he is washing
D. When he was washing