In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Alcohol is high in calories - it supplies _ calories per gram and no nutrients worth mentioning.
[EX A]: seven

[EX Q]: Liquids usually descend in three to five seconds, and solids in _ to twenty seconds.
[EX A]: eight

[EX Q]: Most swimmers workout twice a day, at least for _ hours.
[EX A]:
four