[ Vocabulary ]
A ______________ is a change in a substance that does not involve a change in the identity of the substance.
A. temperature change
B. physical change
C. chemical change
D. identity change
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Prepositions › ViewAre you going to do anything special ___ your birthday?
A. at
B. in
C. on
Past Tenses › View
Mr. Lee ______ his house two months ago.
A. have sold
B. sold