[ 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:
Grammar › ViewWhich are the nouns in this sentence?
Some answers on this test are about electricity.
A. some
B. this
C. test
Conjunctions and Verb Tenses › View
What is the function of the conjunction “and” in the sentence: “She likes apples and oranges”?
A. To show contrast
B. To add information
C. To show cause
D. To indicate time
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.