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: Beryllium has ____ protons and four electrons.

A: four
****
Q: Stereo cameras track the fly's movement in ____ dimensions.

A: three
****
Q: Many mothers tend to monitor feeds by the clock at intervals of every ____ hours.

A:
three
****