[ Grammar for TOEFL ]
Potassium has a valence of positive one because it usually loses one electron when _____ with other elements.
A. does it combine
B. it combines
C. in combining
D. combination
Select your answer:

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Grammar › View
Which of the following sentences correctly uses an appositive?
A. My brother, a doctor, works at the local hospital.
B. My sister a teacher works at the local school.
C. My friend, who is a lawyer works in a law firm.
D. My cousin a dentist, he works in a clinic.