Teacher is to Educate as Doctor is to ?

A. HEAL

Dog is to Bark as Cat is to ?

A. MEOW

In the series X, Y, Z, ?, B, C, which letter is missing?

A. A

In the pattern 2, 4, 6, ?, 10, 12, which number is missing?

B. 8

Identify the missing character in the series 1, 4, 9, ?, 25.

A. 16