41. Edison is the greatest i　　　 　in the world.

42. We know that tea was invented by a　　　 　.

43. One c　　　 　　means a period of one hundred years.

44. I k　　　 　at the door, but there was no answer.

45. The girl is shy. She stands with her back t　　　 　us.

46. The pretty girl gave me a p　　　 　smile.

47. Mom had added salt to the soup, but it wasn’t s　　　 　enough.

48. China is a d　　　 　country now.

49. The n　　　 　on the door said that the library was closed.

50. Boys, stop t　　　 　stones at the poor dog.

25. A. cars　　　 B. planes　　　 C. water　　　 D. space

24. A. to　　　　 B. by　　　　 C. with　　　　 D. in

23. A. more　　　 B. very　　　 C. too　　　　 D. much

22. A. to　　　　 B. into　　　　 C. with　　　 D. including

21. A. taken　　　 B. done　　　 C. made　　　 D. drawn

20. A. used for　　 B. in use　　　 C. used to　　 D. used up

19. A. difficult　　 B. easy　　　 C. quick　　　 D. safe