TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Oceanographers now understand the oceanic circulation much better than _ years ago.

SOLUTION: ten

PROBLEM: Mares normally give birth to their first foal when they are between _ and six years of.

SOLUTION: three

PROBLEM: Complementary opposites are _ colours juxtaposed on the colour wheel.

SOLUTION:
two