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.

[EX Q]: Blood donors can give blood every ____ weeks, or six times a year.
[EX A]: eight

[EX Q]: Heart attacks occur most often around ____ in the morning.
[EX A]: five

[EX Q]: Hemorrhage is extremely uncommon in an eye which has had ____ previous surgery.
[EX A]:
no