diff --git a/exercises/pangram/pangram.spec.js b/exercises/pangram/pangram.spec.js
index efc6e797..d7feee37 100644
--- a/exercises/pangram/pangram.spec.js
+++ b/exercises/pangram/pangram.spec.js
@@ -17,6 +17,26 @@ describe('Pangram()', function()  {
     expect(pangram.isPangram()).toBe(false);
   });
 
+  xit("another missing character 'x'", function() {
+    var pangram = new Pangram("the quick brown fish jumps over the lazy dog");
+    expect(pangram.isPangram()).toBe(false);
+  });
+
+  xit("pangram with underscores", function() {
+    var pangram = new Pangram("the_quick_brown_fox_jumps_over_the_lazy_dog");
+    expect(pangram.isPangram()).toBe(true);
+  });
+
+  xit("pangram with numbers", function() {
+    var pangram = new Pangram("the 1 quick brown fox jumps over the 2 lazy dogs");
+    expect(pangram.isPangram()).toBe(true);
+  });
+
+  xit('missing letters replaced by numbers', function() {
+    var pangram = new Pangram("7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog");
+    expect(pangram.isPangram()).toBe(false);
+  });
+
   xit('pangram with mixed case and punctuation', function()  {
     var pangram = new Pangram("\"Five quacking Zephyrs jolt my wax bed.\"");
     expect(pangram.isPangram()).toBe(true);