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]: Herbs require at least ____ hours of sunlight.
[A]: six

[Q]: Gibberellins are diterpenoids derived from four isoprenoid units forming a system of ____ rings.
[A]: four

[Q]: Female bats suckle their young with milk and weaning usually occurs at the age of ____ to six weeks.
[A]:
four