Question

Explain, explained, explaining, explanation, explanatory
a) The package includes an _____ booklet
b) the instructions are very clear and do not require any further ___.
c) it will only take a couple of minutes to ____ how the program works.
d) if you are new to this system, almost everything will have to be _____.

Answer 1

a) The package includes an _explanatory_ booklet 
b) the instructions are very clear and do not require any further __explanation_.
c) it will only take a couple of minutes to _explain_ how the program works. 
d) if you are new to this system, almost everything will have to be explained.

Answer 2

a)explanatory
b)explanation
c)explain
d)explained