[ 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
Select your answer:
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Grammar › ViewThere are 100 …….. in the field and they ….. white
A. sheep, is
B. sheeps, are
C. sheep, are
D. sheeps, is
Grammar › View
My scores in high school _________ ________ ___________ until I made an effort to study more.
A. couldn’t be improved
B. hadn’t been improving
C. haven’t been improving
D. wouldn’t have improved