In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Stroke is our nation's number _ killer, and a leading cause of disability for older adults.

A: three
****
Q: Placental abruption is _ times more likely to occur in a multiples pregnancy.

A: three
****
Q: Young bandicoots become independent at about _ months and are sexual mature at about five months.

A:
four
****