Let's break down the problem step by step according to the table provided.

The words and their replacements:

Key Words	Replace with
twice	2 times
the difference of	(minus)
a number	n
seven	7

Completing the statements:

1. The word "twice" means 2 times.
2. The words "the difference of" indicate subtraction (minus).
3. The expression is written as 2(n - 7).

Would you like to go over more examples or have any other questions?

Here are 5 related questions for practice:

1. How would you write "twice the sum of a number and five"?
2. What does "three times the difference of a number and four" look like as an expression?
3. Can you write an expression for "half the difference of a number and eight"?
4. How would you express "the difference of twice a number and three"?
5. What is the result of plugging in $n = 10$ into the expression $2(n - 7)$?

Tip: When dealing with phrases like "the difference of," focus on identifying the operation first, and then apply the other operations (like multiplication or addition).