Prime and Composite Numbers

The number which is neither prime nor composite is
 

Consecutive natural numbers are always
 

Which of the following is a pair of co-primes?

Prime triplet less than $10$_____. (Yellow)
 

The successive prime numbers differing by $2$ are called prime _____.
 

The only two consecutive whole numbers which are prime numbers are _____ and $3$.
 

_____ is the greatest prime number less than $20$.
 

Two numbers are said to be _____ if they don't have a common factor other than $1$.
 

Twin primes are primes that differ by _____.
 

_____ is the smallest odd composite number. (Write the number in words)

_____ is the only even prime number. (Write the number in words)
 

The number _____ is neither prime nor composite. (Write the number in words)