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: Irrigation can increase land productivity by three to ____ times, especially in the north.

SOLUTION: seven

PROBLEM: Wood consists of ____ distinct fuels.

SOLUTION: two

PROBLEM: Bacteria produce ____ diffrent ways, sexually and asexually.

SOLUTION:
two