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.

Fruit is a silique opening by ____ valves.
two

Elephants give birth to ____ calf every four to nine years on average.
one

Larval stages extend upto ____ months and the pupal period for nearly three months.
three