PART II    PROOFREADING & ERROR CORRECTION (15 MIN.)

The following passage contains ten errors .Each line contains a maximum of one error. In each case only one word is involved. You should proofread the passage and correct it in the following way:
For a wrong word, underline the wrong word and write the correct one in the blank provided at the end of the line.
For a missing word, mark the position of the missing word with a "^" sign and write the word you believe to be missing in the blank provided at the end    of the line.
For an unnecessary word, cross the unnecessary word with a slash "/" and put the word in the blank provided at the end of the line.

EXAMPLE
When ^ art museum wants a new exhibit,
(1) an
it (never/) buys things in finished form and hangs
(2) never
them on the wall. When a natural history museum   
wants an exhibition, it must often build it.
(3)exhibit
Because the air in the country is really clean, we ought to live
there much as is possible. Since, however, a great deal of the world's
(26)
work must be done indoor in cities, it is important that we take every
(27)
precaution to ventilate our houses properly. Some people have
thought that night air is injurious. But careful study shows that night
air is identical with that which we breath during the day. In face the
(28)
proper ventilation of a bedroom is one of the first necessity for good
(29)
health. Since the exhaled air is usually warmer and lighter than the
inhaled air, it rises to the top of the room. Therefore it is better to
open a window both at the top to let the warm up air out and also at
(30)
the bottom to admit the fresh air in. Of course, this does not mean
(31)
that one should sleep in a strong draft. In many places it is feasible to
sleep out-of-the-doors on a sleeping porch and so to secure perfect
(32)
ventilation.
In recent years we have seen steady progress made in the development
of equipments to supply proper conditioned air not only in large
(33)
auditoriums, class-rooms, and factories, but also in railroad trains
and in private homes. This equipment cleans the air off dust, keeps
(34)
the temperature comfortable, holds the humidity at the right point,
and keeps the air in the motion. Such a condition is conductive to
(35)
efficiency as well as good health.