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: Pyrimidines contain ____ ring and purines contain two rings.

SOLUTION: one

PROBLEM: Coastal kelp beds, for example, appear to be three times larger than in the past four or ____ years.

SOLUTION: five

PROBLEM: Heart disease kills more than ____ times as many women as breast and ovarian cancers combined.

SOLUTION:
five