6. Chinese is quite ______ difficult language for Mike.

5. Roman was not built in ______ day.

4. Beijing is ______ capital of ______ China. It is _______ beautiful city.

3. ______ spaceship flies at about eleven kilometers _______second.

2. We have no classes in ______ afternoon on _______ Saturday.

1. This is ______ old map. It is ______ useful map.

50. The Great Wall is _____ longest wall in the world.

A. a　　　　　 B. an　　　　　 C. the　　　　 D. /

49. There is ____ “f” in the word “first” and _____ “f” is the first letter of the word.

A. a…the　　　 B. a…an　　　 C. an…the　　 D. a…a

48. After ____ lunch, she stayed at home and played ____ piano.

A. the…the　　 B. /…the　　　 C. /…a　　　 D. /…/

47. English is ____ useful language in ____ world.

A. an…the　　 B. the…the　　 C. a…the　　　 D. an…/