[ Vocabulary ]
___________ is an investigation in which all of the conditions are controlled.
A. control
B. experiment
C. scientific method
D. variable
Select your answer:
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Past and Past ContinuousRegular and Irregular AdverbPreposition (at,in,on)Countable - UncountableClauseDegrees of ComparisonConditionalMixed TensesPrepositions of Time
Other quiz:
Future Tenses › ViewBe careful! You_______ into that hole in the ground.
A. will be walking
B. are going to walk
Grammar › View
I have been waiting for the prices of the houses to come down before buying one, but I think I —- too long and the prices —- to go up again.
A. have waited / began
B. wait / began
C. am waiting / are beginning
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