The Great Wall is a 1) ____________name fo a semi-legendary wall built to 2)____________ China’s northern border in the 3rd century BC, and for 3) ____________ stone and earthen fortifications built along a different northern 4) ____________ in the 15th and 16th centuries AD, long after the 5) ____________ structure had disappeared. 6)____________ of the later wall are found today along 7)____________ border areas from Bo Hai in the east to Gansu Province in the west.