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]: Some botanists recognise ____ botanical varieties.
[EX A]: two

[EX Q]: Female dogs come into heat every ____ months or so.
[EX A]: six

[EX Q]: Exotic pheasants show a decline after about ____ years.
[EX A]:
four