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

[EX Q]: Casinos have ____ windows and they have no clocks.
[EX A]: no

[EX Q]: Smoking is responsible for ____ out of four cases of heart disease.
[EX A]:
one