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]: Irrigation can increase land productivity by three to ____ times, especially in the north.
[EX A]: seven

[EX Q]: Arthropods are made up of ____ groups of living animals and one group of extinct animals.
[EX A]: four

[EX Q]: Summer is the season of the midnight sun when it really never gets dark for almost ____ months.
[EX A]:
three