TASK DEFINITION: Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
PROBLEM: International trade is a ____ way street.

SOLUTION: two

PROBLEM: Biological islands are of ____ general types, geographical and ecological.

SOLUTION: two

PROBLEM: Reclaimed water is sewage water that has been treated and disinfected using ____ different methods.

SOLUTION:
four