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]: Fossil fuels come in ____ major forms coal, oil and natural gas.
[A]: three


[Q]: Most ducks acquire breeding plumage in the fall, ____ or seven months before other birds.
[A]: six


[Q]: Women have about ____ times as many foot problems as men.
[A]:
four