Which of the following is the 8 digit code and extended

The prolific author published three books in a single year.

CADENCE 

Select the wrongly spelt word.

 Fill in the blanks with the appropriate antonym of the word in Italic from the options given:

A) Languish           B) Mundane      C) Naive     D) Routine

The act or result of making a condition, injury, etc., worse

Select the option that can be used as a one-word substitute for the given group of words.

An annual calendar that contains important dates and time

There has been a serious kerfuffle in the news about the buttons and their relative size.

Select the INCORRECTLY spelt word.

SERENE