[ Prepositions of Time and Place ]
My classroom is ________ the seventh floor of the Building F.
A. at
B. in
C. inside
D. on

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Vocabulary › ViewIn an experiment, the factor whose value changes because of a change in the independent variable.
A. Independent Variable
B. Control Variable
C. Dependent Variable
D. Convection Variable
E. Constant Variable
Grammar › View
I’ll be at my uncle’s house in case you need to reach me.
A. Correct
B. Incorrect