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.

[Q]: Sexual reproduction involves the union of cells from ____ parents.
[A]: two


[Q]: Unemployment Identify the ____ types of unemployment.
[A]: four


[Q]: Air pollution is described to the public in ____ bands low, moderate, high and very high .
[A]:
four