[ Vocabulary ]
single source of air pollution
A. point source
B. nonpoint source
C. ozone
D. conservation
Random Topics:
Adverbs of frequencyTOEFL Adjective and AdverbPassive Voice in Past Simple TenseGrammar Past and Future TenseInfinitives and ING FormsArticles & PrepositionTime and CalendarPast Tense and Past ContinuousWould/would like - affirmative/negativeComparatives and SuperlativesOther quiz:
Grammar › ViewHelmets must ________________ past this point.
A. wear
B. be worn
C. are worn
Vocabulary › View
Your ___ of what happened is different from mine.
A. idea
B. content
C. version
D. guess
Modals › ViewHe ________ ride a bike because he never learned how.
A. can
B. can’t
Modals and Present Tenses › View
Michael and Daniel _____ a lot these days, but _____ their assets.
A. is traveling / can sell
B. cannot travel / is selling
C. can travel / selling
D. are traveling / cannot sell