[ Grammar ]
If we ……… littering, the environment will be polluted.
A. turn off
B. go on
C. go to
D. turn on

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Conditionals (0 - 1 - 2)Modal Verb, Passive VoiceComparisonsSimple and Continuous Present TenseModals and Active and Passive VoiceArticles and NounsTime ExpressionsSentence and FragmentComperative and SuperlativePersonal pronouns + possessive adjectives + Introgative pronounsOther quiz:
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A person who acts is an act___.
a. er
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