diff --git a/lib/questions.rb b/lib/questions.rb
index 823db48..485af2b 100644
--- a/lib/questions.rb
+++ b/lib/questions.rb
@@ -1,4 +1,4 @@
-# keep only the elements that start with an a
+# keep only the elements that start with an 'a'
 def select_elements_starting_with_a(array)
 end
 
@@ -22,11 +22,11 @@ def reverse_every_element_in_array(array)
 # given an array of student names, like ['Bob', 'Dave', 'Clive']
 # give every possible pairing - in this case:
 # [['Bob', 'Clive'], ['Bob', 'Dave'], ['Clive', 'Dave']]
-# make sure you don't have the same pairing twice, 
+# make sure you don't have the same pairing twice,
 def every_possible_pairing_of_students(array)
 end
 
-# discard the first 3 elements of an array, 
+# discard the first 3 elements of an array,
 # e.g. [1, 2, 3, 4, 5, 6] becomes [4, 5, 6]
 def all_elements_except_first_3(array)
 end
@@ -51,7 +51,7 @@ def get_first_half_of_string(string)
 def make_numbers_negative(number)
 end
 
-# turn an array of numbers into two arrays of numbers, one an array of 
+# turn an array of numbers into two arrays of numbers, one an array of
 # even numbers, the other an array of odd numbers
 # even numbers come first
 # so [1, 2, 3, 4, 5, 6] becomes [[2, 4, 6], [1, 3, 5]]
@@ -149,7 +149,7 @@ def format_date_nicely(date)
 def get_domain_name_from_email_address(email)
 end
 
-# capitalize the first letter in each word of a string, 
+# capitalize the first letter in each word of a string,
 #  except 'a', 'and' and 'the'
 # *unless* they come at the start of the start of the string, e.g.
 # 'the lion the witch and the wardrobe' becomes
@@ -168,7 +168,7 @@ def check_a_string_for_special_characters(string)
 def get_upper_limit_of(range)
 end
 
-# should return true for a 3 dot range like 1...20, false for a 
+# should return true for a 3 dot range like 1...20, false for a
 # normal 2 dot range
 def is_a_3_dot_range?(range)
 end
@@ -218,7 +218,7 @@ def fizzbuzz_without_modulo
 
 # print the lyrics of the song 99 bottles of beer on the wall
 # http://www.99-bottles-of-beer.net/lyrics.html
-# make sure you use the singular when you have one bottle of 
+# make sure you use the singular when you have one bottle of
 # beer on the wall, and print 'no more bottles of beer on the wall'
 # at the end.
 # (there's no RSpec test for this one)