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

[EX Q]: Many Asian countries deny entry to travelers whose passports are valid for less than _ months.
[EX A]: six

[EX Q]: B cells can receive stimulation in _ ways.
[EX A]: two

[EX Q]: Drip irrigation sends water straight to a plant's roots with virtually _ loss to evaporation.
[EX A]:
no