[ Vocabulary ]
A ________ is any condition in an experiment that can be changed.
A. control
B. experiment
C. scientific method
D. variable
Select your answer:
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Grammar › View__________more help, I could call my neighbor.
A. needed
B. should I need
C. I have needed
D. I should need
Vocabulary › View
His ___________ decision helped the team succeed.
A. decisive
B. decision
C. decide
D. decisively