diff --git a/src/m1e_comments_strings_print.py b/src/m1e_comments_strings_print.py
index 18eb8a0..1f0f748 100644
--- a/src/m1e_comments_strings_print.py
+++ b/src/m1e_comments_strings_print.py
@@ -14,3 +14,6 @@
 print('one', 'two', 'buckle my shoe')
 print(3 + 9)
 print('3 + 9', 'versus', 3 + 9)
+print('3/2')
+print(3/2)
+
diff --git a/src/m3_turtles.py b/src/m3_turtles.py
index df507f3..083a223 100644
--- a/src/m3_turtles.py
+++ b/src/m3_turtles.py
@@ -2,7 +2,7 @@
 Demonstrates using OBJECTS via Turtle Graphics.
 
 Concepts include:
-  -- CONSTRUCT an INSTANCE of a CLASS (we call such instances OBJECTS).
+  -- CSSE 120 (we call such instances OBJECTS).
   -- Make an object   ** DO **   something by using a METHOD.
   -- Reference an object's   ** DATA **   by using an INSTANCE VARIABLE.
 
@@ -62,17 +62,25 @@
 # ----------------------------------------------------------------------
 dave.forward(100)
 dave.left(90)
-dave.forward(200)
+dave.forward(100)
+dave.left(90)
+dave.forward(100)
+dave.left(90)
+dave.forward(100)
 
 # ----------------------------------------------------------------------
 # Construct a new turtle and ask it to do things.
 # ----------------------------------------------------------------------
 matt = rg.SimpleTurtle('turtle')
-matt.pen = rg.Pen('red', 30)
-matt.speed = 10  # Faster
-matt.backward(50)
+matt.pen = rg.Pen('green', 15)
+matt.speed = 14  # Faster
+matt.backward(200)
 matt.left(90)
-matt.forward(50)
+matt.forward(200)
+matt.right(90)
+matt.forward(200)
+matt.right(90)
+matt.forward(200)
 
 
 ########################################################################
diff --git a/src/m5_your_turtles.py b/src/m5_your_turtles.py
index d9de2a6..0bfab5d 100644
--- a/src/m5_your_turtles.py
+++ b/src/m5_your_turtles.py
@@ -2,7 +2,7 @@
 Your chance to explore Loops and Turtles!
 
 Authors: David Mutchler, Dave Fisher, Valerie Galluzzi, Amanda Stouder,
-         their colleagues and PUT_YOUR_NAME_HERE.
+         their colleagues and Xuechen Bai.
 """
 ########################################################################
 # TODO: 1.
@@ -27,4 +27,31 @@
 #  fixing them at either this session OR at the NEXT session.
 #
 #  Don't forget to COMMIT your work by using  VCS ~ Commit and Push.
-########################################################################
+############################################################################
+
+import rosegraphics as rg
+window = rg.TurtleWindow()
+lanxi = rg.SimpleTurtle('turtle')
+lanxi.pen = rg.Pen('pink', 3)
+lanxi.speed = 10
+for k in range(20):
+    lanxi.draw_circle(radius=100-5*k)
+    lanxi.pen_up()
+    lanxi.right(90)
+    lanxi.backward(10)
+    lanxi.left(90)
+    lanxi.pen_down()
+
+james = rg.SimpleTurtle('turtle')
+james.pen = rg.Pen('light blue', 3)
+james.speed = 10
+for k in range(20):
+    james.draw_circle(radius=100-5*k)
+    james.pen_up()
+    james.right(90)
+    james.forward(10)
+    james.left(90)
+    james.pen_down()
+
+window.close_on_mouse_click()
+