Which of the following sentences is written correctly?
a.
our teacher will let us study outside if we promise to concentrate.
b.
whenever we study outside on the hill right next to the principal's office.
c.
if we promise to concentrate on learning poetry forms and rhyme.
d.
our teacher, who has published many poems and a poetry textbook.

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.

the answer is b to the question