[ Grammar ]
Generally, most cells perform ____________ functions.
A. Specialize
B. Its specialized
C. They specialize
D. Their specialized

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Vocabulary and Sentence Structure › ViewEvery year, millions of people from the countryside move to urban areas.
A. Rural
B. disadvantaged
C. modern
D. developed
Grammar › View
My best friend could __ a skateboard when she was six.
A. ride
B. rode
C. to ride
D. riding
Indefinite Pronouns › ViewI didn’t do …………………….. wrong.
A. anything
B. nothing
C. something
Modals › View
___ we discuss this tomorrow?
A. Will
B. Should
C. Shall
D. Might
