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

Q: Plazas have _ accumulations of rubbish but are covered with even layers of mud bricks and plaster.

A: no
****
Q: Yews typically have _ flushes of growth each growing season.

A: two
****
Q: Salicylic acid has a half life of about _ hours at therapeutic doses.

A:
four
****