TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Pelagic division is divided into neritic and _ levels of pelagic provinces.

SOLUTION: three

PROBLEM: Echocardiography demonstrates in clear, graphic fashion the _ cardiac chambers and four valves.

SOLUTION: four

PROBLEM: Studies show our brains comprehend speech at _ to five times faster than people normally speak.

SOLUTION:
four