13.  A.industry.      b.industrial.         c.industrialize.      D. Industrialism
14. A. At.     B. For.     C. Of   D. To
15.   A. Know.  B. Knew.     C. Knowing.     D. Known
16. A.in.     B.at.    C.on.  D.for
17. A.developed.   B. Develop.     c.developing.      D. To develop
18. A.find.  B.finding.     C. found.      D.finded
19. A. Include.       B. Including.     C.included.     D.includsion
20. A.discover.     B. discovering.    C.to discover.          C. discovered

1.A
2.C
3.D
4.A
5.D
6.B
7.A
8.D
9.B
10,D