14. It ____ now pretty late, we took our things and retired to our room.
A. is      
B. being       
C. turned       
D. got

15. ____ with the size of the whole earth, the highest mountain does not seem high at all.
A. When compared         
B. While comparing
C. Compare          
D. Comparing

答案及解析：
1. A
2. B
3. A
4. A
5. A
6. A 
7. C 
8. B 
9. C 
10. C
11. A 
12. A
13. C
14. B
15. A