[ Grammar ]
Acid rain can be caused due to combustion of fossil fuels or erupting volcanoes or rotting vegetation which ____ sulfur dioxide and nitrogen oxides into the atmosphere.
A. release
B. releases
C. is releasing
D. have released
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Past Perfect and Past Perfect Continuous TenseAdverbs of Manner, Likes and PreferencesModals and PhrasesGrammar - First ConditionalTime and CalendarPassive Voice - Present Simple and Past SimpleTo Infinitive/Bare Infinitive/GerundsApologizingClauses of ReasonRelative Pronouns with PrepositionsOther quiz:
Can vs be able to › ViewMary __________ sing. She’s part of the school band.
A. is able to
B. was able to
C. can
Grammar & Vocabulary › View
Choose the Correct Sentence
A. Listen! The birds sing outside.
B. Listen! The birds are singing outside.