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: Fish kills can occur when oxygen is less than ____ ppm.

A: three
****
Q: Differentiation is caused by the energy going in ____ directions.

A: two
****
Q: Some houses have as many as ten people living in ____ room.

A:
one
****