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.

Asbestos is a generic term used to describe the fibrous form of ____ different minerals.
six

Buses are ____ times as fuel efficient as cars.
five

Most infants double their birth weight in ____ months and triple it in a year.
six