Updated materials based on feedback from the pilot testing

Author: xinyinghou

_sources/turtles/SE_turtle/pp-intro-SE.rst

@@ -91,8 +91,8 @@ The clicable area are those with a dark gray background and a border around them
 You will then receive a completed explanatoin of the solution you got from solving the mixed-up puzzle.
 
 
-.. image:: https://i.postimg.cc/DvVqXB8F/SE-introduction.png
-    :width: 450
+.. image:: https://i.postimg.cc/SmDGs7mZ/SE-introduction.png
+    :width: 600
     :align: center
 
 Four types of feedback will be provided for each option you select.
@@ -150,4 +150,4 @@ What to do next
         a.href = "pps-SE-pp1.html"
       };
 
-    </script>
+    </script>

_sources/turtles/SE_turtle/pps-posttest.rst

@@ -87,7 +87,7 @@ Fill in all that apply
 
     **D.** Both code snippets will print out the same sequence of numbers.
 
-    - :[\s\S]:    Thank you for answering the question.
+    - :[\s\S]+:    Thank you for answering the question.
       :.*: Please fill in the blank
 
 
@@ -113,7 +113,7 @@ Fill in all that apply
 
     **D.** The t.color() method should not be used with an argument, such as "blue".
 
-    - :[\s\S]:    Thank you for answering the question.
+    - :[\s\S]+:     Thank you for answering the question.
       :.*: Please fill in the blank
 
 
@@ -142,7 +142,7 @@ Fill in all that apply
 
     **E.** The turtle moves 90 units to the left.
 
-    - :[\s\S]:    Thank you for answering the question.
+    - :[\s\S]+:     Thank you for answering the question.
       :.*: Please fill in the blank
 
 
@@ -157,7 +157,7 @@ Fill in all that apply
        :width: 800
        :align: center
 
-    - :[\s\S]:    Thank you for answering the question.
+    - :[\s\S]+:     Thank you for answering the question.
       :.*: Please fill in the blank