171.

172.

Somewhat analogous to the Chinese system of writing in difficulty for non-native speakers to learn and loosely based on the Chinese system of writing the Japanese system of writing known as Kanji.

to
difficulty
loosely based
the

173.

 ______ big cats, housecats have polyphasic sleeping patterns; that is, they take several naps a day.

They are like
Like
It is the
The

174.

It was as a direct result of the widespread implementation electricity that the U.S. had a source of light other than gas lights.

It was as
result of
implementation
a source of

175.

 ______ many communications companies are now able to offer radio and television broadcasts over the Internet.

Advanced technology has enabled
Introducing advanced technology and
Because the introduction of advanced technology
With the introduction of advanced technology

176.

While it is actually a planet, Venus is often mistaken a star in the night sky.

While it
a planet
mistaken
the night

177.

______ its area of defense, a fort should be built on an elevation and with some sort of natural feature of the landscape to obstruct direct access to the fort.

To better protect
Protecting better
For the better of
It is better for

178.

In 2000 William Jefferson Clinton entered his last year office as President of the United States.

In 2000
entered
office
as President

179.

It was ______ the Industrial Revolution that the United States was able to increase productivity through mechanization.

when
at the time
during
because

180.

______ Einstein was able to come up with a theory that has yet to be disproved.

Other scientists
Similar to other scientists
Just as other scientists
To be a scientist