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]: Fish kills can occur when oxygen is less than ____ ppm.
[EX A]: three

[EX Q]: Lobelia Take ____ capsules after three meals each day.
[EX A]: two

[EX Q]: Refraction occurs ____ times, as the light intersects the vessel s inner and outer surfaces .
[EX A]:
four