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]: Scientists think that macaws mate for life, producing one to ____ young each year.
[EX A]: three

[EX Q]: Norplant implants are ____ matchstick size rods that are inserted into the upper arm.
[EX A]: six

[EX Q]: Hypothermia has ____ main types of causes.
[EX A]:
two