A) before the mechanic instaled the new eguipment,he examined it thoroughly.
b)After Cornel wrote the poem delicated to this mother, he read it to this elder brother.
c)Andy bought this book in the best book shop of our town.
d)When I entered the classroom, the student on duty cleaned the blackboard.
e)When Alina entered the classroom, the teacher started already lesson.
f)While did my homework,my younger sister drew a picture