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]: Soy products contain ____ known classes of anti-cancer agents, including phytoestrogens.
[EX A]: five

[EX Q]: Elephants give birth to ____ calf every four to nine years on average.
[EX A]: one

[EX Q]: Pakistani expatriates play an important role in the economies of the ____ Arab Gulf countries.
[EX A]:
six