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]: Wombats measure up to ____ feet long and weigh from thirty to seventy-five pounds.
[A]: four


[Q]: Polymorphism consists of ____ root words, poly and morph.
[A]:
two