Fill in the Blanks Exam preparation- listeningOnline version Write NO MORE THAN THREE WORDS for each answer. by Andrea Mosquera 1 rammed erosion feats eyesight frequent sandstorms earth architectural susceptible to 36 . Before the use of bricks , the Great Wall was mainly built from stones , wood and . 37 . Many western sections of the wall are constructed from mud and thus are more . 38 . A part of the wall in Gansu province may disappear in the next 20 years , due to . 39 . To see the wall from the Moon would require superhuman . 40 . The Great Wall is generally recognized as one of the most impressive in history .