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.

[EX Q]: Arthropods are made up of ____ groups of living animals and one group of extinct animals.
[EX A]: four

[EX Q]: Most dens are oval shape, six to ____ feet long and about six feet in height and width.
[EX A]: nine

[EX Q]: Carbon dioxide accounts for ____ fourths of the predicted increase in the greenhouse effect.
[EX A]:
three