Question

образуйте во мн. ч. cheese, child, crisis, room, fellow, time, formula, class-mate, mother-in-law, man, student, tooth, people, figure.

Answer 1

child - children
man - men
tooth - teeth
people - person
class-mate - class-mates

Answer 2

Children,times,formulas,rooms,class-mates,men,students,teeth