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: Neutrons consist of one up quark and ____ down quarks.

A: two
****
Q: Swedes generally get ____ weeks of vacation each year and much of it is spent outdoors.

A: five
****
Q: Female dugongs give birth every ____ to seven years.

A:
three
****