[ Vocabulary ]
a poisonous gas made of 3 oxygen atoms
A. point source
B. nonpoint source
C. ozone
D. conservation
Random Topics:
Linking VerbSimple, Compound, Complex SentencesConditionalsAdverb of MannerGrammar - Present Perfect with already, just, yetInversions and SubjunctivePassive Modals in Different TensesSecond ConditionalsWord FormationModals of ProhibitionOther quiz:
Abstract Noun vs Concrete Noun › Viewidea
A. Concrete
B. Abstract
Grammar › View
The kids were tired, ______ they were happy.
A. so
B. or
C. but
D. and
Progressive Tense › ViewHe will not be…… at the library tonight,so he will not see jenny when she arrives.
A. Studying
B. Studies
C. Student
D. Study
Past Tense › View
Choose the Past Simple of this word.
teach
A. taught
B. teached
C. teaching
D. teachs