16. 

Observe the dots on the dice (one to six dots) in the following figures. How many dots are contained on the face opposite to the containing four dots?

A. 2
B. 3
C. 5
D. 6

17. 

Two positions of a dice are shown below. When 3 points are at the bottom, how many points will be at the top?

A. 2
B. 5
C. 4
D. 6

18. 

From the positions of a cube are shown below, Which letter will be on the face opposite to face with 'A'?

A. D
B. B
C. C
D. F