[ Vocabulary ]
The same amount of matter exists before and after the change—none is created or destroyed
A. closed system
B. conservation of matter
C. chemical reaction
D. solution
Random Topics:
Adjectives and comparisonsGrammar - to be, possessive, have gotGrammar - Sentence StructureGrammar on ConditionalsTransitive or Intransitive VerbsNoun, Pronoun, Adjective, VerbRegular Plural NounsPerfect Verb Tenseswill, be going to, would like toPast PerfectOther quiz:
Vocabulary › Viewa container made of metal bars and used for keeping animals in
A. upset
B. emphatic
C. cage
D. ground
Modals › View
A: Where are my keys?
B: I don’t know. You __________ them in the car!
A. may have left
B. could leave
C. had to leave
D. should have left