diff --git a/src/m2_hello_world.py b/src/m2_hello_world.py
index aaa506a..dc310d8 100644
--- a/src/m2_hello_world.py
+++ b/src/m2_hello_world.py
@@ -13,7 +13,7 @@
 
 ########################################################################
 #
-# TODO: 1.
+# DONE: 1.
 #   (Yes, that means for YOU to DO things per these instructions:)
 #
 #   Run this module by right clicking anywhere in this window and select
@@ -26,7 +26,7 @@
 
 ########################################################################
 #
-# TODO: 2.
+# DONE: 2.
 #   Notice the small horizontal BLUE bars on the scrollbar-like thing
 #   on the right.  Each blue bar indicates a TO DO in this module.
 #
@@ -59,10 +59,10 @@
 #   Look at the Console to be sure that your string printed as expected.
 #
 ########################################################################
-
+print("Hi")
 ########################################################################
 #
-# TODO: 4.
+# DONE: 4.
 #   Add yet another   print   statement.
 #   This one should print the *product* of 3,607 and 34,227.
 #   Let the computer do the arithmetic for you (no calculators!).
@@ -73,10 +73,10 @@
 #   (HINT: It is an INTERESTING number.)  Get help if your value is wrong.
 #
 ########################################################################
-
+print(3607*34227)
 ########################################################################
 #
-# TODO: 5.
+# DONE: 5.
 #   Look at the list of files in this project to the left.
 #   Note that this file (m2_hello_world.py) is now displayed in a blue
 #   font color (if the file is highlighted select a different file so yu can
diff --git a/src/m3_turtles.py b/src/m3_turtles.py
index df507f3..fd7614d 100644
--- a/src/m3_turtles.py
+++ b/src/m3_turtles.py
@@ -10,11 +10,11 @@
   -- ASSIGNING a VALUE to a NAME (VARIABLE).
 
 Authors: David Mutchler, Dave Fisher, Valerie Galluzzi, Amanda Stouder,
-         their colleagues and PUT_YOUR_NAME_HERE.
+         their colleagues and Shuai Yuan.
 """
 ########################################################################
 #
-# TODO: 1.
+# DONE: 1.
 #  (Yes, that means for YOU to DO things per these instructions:)
 #
 # On Line 13 above, replace  PUT_YOUR_OWN_NAME_HERE  with your OWN name.
@@ -29,7 +29,7 @@
 
 ########################################################################
 #
-# TODO: 2.
+# DONE: 2.
 #   Allow this file to use the rosegraphics.py file by marking the src
 #   directory as a "Sources Root".  Do that by right clicking on the src folder,
 #   then selector  Mark Directory As --> Sources Root
@@ -75,9 +75,10 @@
 matt.forward(50)
 
 
+
 ########################################################################
 #
-# TODO: 3.
+# DONE: 3.
 #   Add a few more line of your own code above to make one of the
 #   existing Turtles move some more and/or have different
 #   characteristics.
@@ -88,10 +89,13 @@
 #   As always, test by running the module.
 #
 ########################################################################
-
+matt.backward(100)
+matt.forward(50)
+matt.left(90)
+matt.forward(50)
 ########################################################################
 #
-# TODO: 4.
+# DONE: 4.
 #   The code above  CONSTRUCTS  two SimpleTurtle objects and gives those objects NAMES:
 #       dave    matt
 #
@@ -109,10 +113,22 @@
 #   As always, test by running the module.
 #
 ########################################################################
-
+RT = rg.SimpleTurtle('turtle')
+RT.pen = rg.Pen('green',25)
+RT.speed = 8
+RT.left(45)
+RT.forward(50)
+RT.right(45)
+RT.forward(50)
+RT.right(45)
+RT.forward(50)
+RT.right(90)
+RT.forward(180)
+RT.left(135)
+RT.forward(130)
 ########################################################################
 #
-# TODO: 5.
+# DONE: 5.
 #   Run one more time to be sure that all is still OK.
 #   Ensure that no blue bars on the scrollbar-thing to the right remain.
 #
diff --git a/src/m5_your_turtles.py b/src/m5_your_turtles.py
index d9de2a6..184107c 100644
--- a/src/m5_your_turtles.py
+++ b/src/m5_your_turtles.py
@@ -2,15 +2,15 @@
 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 Shuai Yuan.
 """
 ########################################################################
-# TODO: 1.
+# DONE: 1.
 # On Line 5 above, replace  PUT_YOUR_NAME_HERE  with your own name.
 ########################################################################
 
 ########################################################################
-# TODO: 2.
+# DONE: 2.
 #
 #  You should have RUN the PREVIOUS module and READ its code.
 #  (Do so now if you have not already done so.)
@@ -28,3 +28,45 @@
 #
 #  Don't forget to COMMIT your work by using  VCS ~ Commit and Push.
 ########################################################################
+import rosegraphics as rg
+
+window = rg.TurtleWindow()
+
+zhang = rg.SimpleTurtle('turtle')
+zhang.pen = rg.Pen('blue', 5)
+zhang.speed = 10
+radius = 150
+for k in range(6):
+    zhang.draw_circle(radius)
+    zhang.pen_up()
+    zhang.right(45)
+    zhang.forward(10)
+    zhang.left(45)
+    zhang.pen_down()
+    radius = radius - 12
+
+zheng = rg.SimpleTurtle('turtle')
+zheng.pen = rg.Pen ('red', 5)
+zheng.speed = 10
+size = 100
+for k in range (6):
+    zheng.draw_regular_polygon(10,size)
+    zheng.pen_up()
+    zheng.right(45)
+    zheng.forward(10)
+    zheng.left(45)
+    zheng.pen_down()
+    size = size - 12
+
+zz = rg.SimpleTurtle('turtle')
+zz.pen = rg.Pen('green', 5)
+zz.speen = 10
+side = 100
+for k in range (6):
+    zz.draw_square(side)
+    zz.pen_up()
+    zz.right(45)
+    zz.forward(10)
+    zz.left(45)
+    zz.pen_down()
+    side = side -12
\ No newline at end of file