[ Grammar ]
Stella and Artyom are studying together. They help ____ prepare for the test.
A. themselves
B. himself
C. her
D. each other

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Grammar › ViewThe boy made ____________ a loud noise on the bus that other passengers stared at him.
A. too
B. so
C. up
D. such
too / enough › View
I can’t study here because it isn’t _____________.
A. too quiet
B. quiet enough