Please keep __________ eye on the little boy.
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Hiking means traveling __________, usually with a backpack.
A. on foot
B. on the foot
C. on feet
D. by foot
Boys often take __________ in playing jokes about girls.
A pleasure
B. the pleasure
C. pleasure
D. pleasures
Her father is __________.
A. a professor and a doctor
B. a professor and doctor
C. professor and doctor
D. the professor and doctor
__________ teacher and __________ guardian of the child were discussing his education.
A, a
B. The, a
C. A, the
D. The, the
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