[ Vocabulary ]
widespread sources of air pollution
A. point source
B. nonpoint source
C. ozone
D. conservation

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Grammar - ConnectorsTenses (Present, Past, Future Forms)Modals and Phrasesmust/shouldUse of Prepositions or ConjunctionsAdverbs of TimeCity PlacesWho vs WhomGrammar / PronounsHelpful PhrasesOther quiz:
Tenses › ViewWe use verbs in past participle with:
A. past simple
B. present perfect
C. future simple
D. past continuous
Verb Tenses › View
Use the present perfect tense in a sentence about your achievements.
A. I have completed several projects successfully.
B. I will complete several projects successfully.
C. I completed several projects successfully.
D. I am completing several projects successfully.
Adverbs, Modals, Preposition of time › ViewShe finishes her paper round ________ eight o’clock.
A. at
B. in
C. on
Grammar › View
Choose the type of sentence that describe the sentence below best:
Fall is my favorite season.
_
A. Declarative
B. Interrogative
C. Imperative
D. Exclamatory
