The author uses the word "immediacy" (line 39) most likely in order to express

Ravi on July 23, 2019

@Troy,

The difference between missing premise and argument completion drills
is that the scope of the drills is different. With missing premise
drills, you're filling in a premise. With argument completion drills,
you're looking to complete the argument, and maybe you're adding a
conclusion or a premise. In other words, argument completion drills
generally can encompass more than missing premise drills.

I recommend reviewing the curriculum on quantifiers, as there are many
examples there that show you how to solve for the missing premise. The
video lectures will also help you to internalize the strategies for
solving these questions.

For specific questions, let us know by posting questions to the
message board for the questions you're wanting further clarification
on so we can help. Let us know if you have any other questions!