[ Vocabulary ]
a physical system that does not allow transfer of matter in or out of the system
A. conservation of matter
B. closed system
C. reactant
D. chemical reaction
Random Topics:
Articles and PronounsGrammar (either..or.. and neither..nor..)Adverbs of Manner, Likes and PreferencesVocabulary and PrepositionsIndirect SpeechDemonstrative PronounModals and Past ModalsProgressive TensePast Simple VerbsTenses and VerbsOther quiz:
Grammar › ViewThe students __ written longer essays, but the teacher said ten pages was long enough.
A. should have
B. could have
C. would have
Subject-Verb Agreement › View
Half of the books _______ novels.
A. Is
B. Are
The adjectives are words use to describe a person, place or thing
A. TRUE
B. FALSE
Question Tags › View
You didn’t turn of the light,……?
A. right
B. did you
C. didn’t you
D. did I