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The Great Wall of China is known to be over 1900 kilometers long, 16 it by far the longest wallin the world. If it were laid out in a straight line, it 17 6500 kilometers—as it has many bends andcurves. The building of the wall 18 begun in the third century B.C. by the Emperor Shih Huangti.The reason it was built was to keep the Huns out of Central Asia. Over the centuries, it 19 addedto, rebuilt and repaired. Not only 20 one of the greatest creations of mankind, but it is also theonly man-made structure visible from space.
16.
(A) and makes
(B) to make
(C) making
(D) that makes

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