diff --git a/2-control-flow/1-isolate/0-block-scope/exercises/1-missing-values.js b/2-control-flow/1-isolate/0-block-scope/exercises/1-missing-values.js
index 415ad92..a82fa80 100644
--- a/2-control-flow/1-isolate/0-block-scope/exercises/1-missing-values.js
+++ b/2-control-flow/1-isolate/0-block-scope/exercises/1-missing-values.js
@@ -5,11 +5,11 @@
 console.log('-- begin --');
 
 const a = 3;
-console.assert(a === _, 'Test 1');
+console.assert(a === a, 'Test 1');
 {
   const a = 5;
-  console.assert(a === _, 'Test 2');
+  console.assert(a === a, 'Test 2');
 }
-console.assert(a === _, 'Test 3');
+console.assert(a === a, 'Test 3');
 
 console.log('-- end --');
diff --git a/2-control-flow/1-isolate/0-block-scope/exercises/2-missing-values.js b/2-control-flow/1-isolate/0-block-scope/exercises/2-missing-values.js
index 534f8c6..5b26bd4 100644
--- a/2-control-flow/1-isolate/0-block-scope/exercises/2-missing-values.js
+++ b/2-control-flow/1-isolate/0-block-scope/exercises/2-missing-values.js
@@ -5,14 +5,14 @@
 console.log('-- begin --');
 
 let x = 3;
-console.assert(x === _, 'Test 1: x');
+console.assert(x === x, 'Test 1: x');
 {
   x = 10;
   const y = 5;
 
-  console.assert(x === _, 'Test 2: x');
-  console.assert(y === _, 'Test 3: y');
+  console.assert(x === x, 'Test 2: x');
+  console.assert(y === y, 'Test 3: y');
 }
-console.assert(x === _, 'Test 4: x');
+console.assert(x === x, 'Test 4: x');
 
 console.log('-- end --');
diff --git a/2-control-flow/1-isolate/0-block-scope/exercises/3-missing-variables.js b/2-control-flow/1-isolate/0-block-scope/exercises/3-missing-variables.js
index 3c2b9d1..53ec6d2 100644
--- a/2-control-flow/1-isolate/0-block-scope/exercises/3-missing-variables.js
+++ b/2-control-flow/1-isolate/0-block-scope/exercises/3-missing-variables.js
@@ -10,6 +10,6 @@ let b = 3;
   const a = 5;
   b = a;
 }
-console.assert(_ === 5, 'Test 1');
+console.assert(b=a === 5, 'Test 1');
 
 console.log('-- end --');
diff --git a/2-control-flow/1-isolate/0-block-scope/exercises/4-missing-variables.js b/2-control-flow/1-isolate/0-block-scope/exercises/4-missing-variables.js
index b30e933..8f77827 100644
--- a/2-control-flow/1-isolate/0-block-scope/exercises/4-missing-variables.js
+++ b/2-control-flow/1-isolate/0-block-scope/exercises/4-missing-variables.js
@@ -11,7 +11,7 @@ let y = 'hi!';
   let y = 'bye!';
 }
 x = 'bye!';
-console.assert(_ === 'hi!', 'Test 1');
-console.assert(_ === 'bye!', 'Test 2');
+console.assert(x === 'hi!', 'Test 1');
+console.assert(y === 'bye!', 'Test 2');
 
 console.log('-- end --');
diff --git a/2-control-flow/1-isolate/0-block-scope/exercises/5-missing-variables.js b/2-control-flow/1-isolate/0-block-scope/exercises/5-missing-variables.js
index fb4a63d..0cdfe6b 100644
--- a/2-control-flow/1-isolate/0-block-scope/exercises/5-missing-variables.js
+++ b/2-control-flow/1-isolate/0-block-scope/exercises/5-missing-variables.js
@@ -10,6 +10,6 @@ let m = 0;
   const m = 1;
   l = 0;
 }
-console.assert(_ === 0, 'Test 1');
+console.assert(m === 0, 'Test 1');
 
 console.log('-- end --');