Choose the best option that best completes the gap(s):
The _____ event takes place every two years.
Answer Details
The best option to complete the sentence is "biennial." Biennial means occurring every two years, and it is commonly used to describe events that happen once every two years.
"Bienial" and "biannal" are misspellings of "biennial," and they do not exist in the English language. "Biannual" is a word that means occurring twice a year, so it would not be the best choice to describe an event that happens every two years.