[ 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:
Adjective › View
a.famous
b.dangerous
c.cute
d.far
Vocabulary › View
What does “Implant” mean?
A. To place something inside the body
B. An improvement to the function or quality of something
C. A feeling of alarm or worry
D. Annoy or bother
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