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: Neutrinos are particles with almost ____ mass and no electric charge.

A: no
****
Q: Elephants also have four molars, ____ on the top and one on the bottom on both sides of the mouth.

A: one
****
Q: Adult dogs receive a rabies vaccine every ____ years.

A:
three
****