diff --git a/exercises/07_structs/structs1.rs b/exercises/07_structs/structs1.rs
index 959c4c6a..86874e45 100644
--- a/exercises/07_structs/structs1.rs
+++ b/exercises/07_structs/structs1.rs
@@ -1,9 +1,12 @@
 struct ColorRegularStruct {
     // TODO: Add the fields that the test `regular_structs` expects.
     // What types should the fields have? What are the minimum and maximum values for RGB colors?
+    red: i32,
+    green: i32,
+    blue: i32,
 }
 
-struct ColorTupleStruct(/* TODO: Add the fields that the test `tuple_structs` expects */);
+struct ColorTupleStruct(i32, i32, i32);
 
 #[derive(Debug)]
 struct UnitStruct;
@@ -19,7 +22,7 @@ mod tests {
     #[test]
     fn regular_structs() {
         // TODO: Instantiate a regular struct.
-        // let green =
+        let green = ColorRegularStruct { red: 0, green: 255, blue: 0 };
 
         assert_eq!(green.red, 0);
         assert_eq!(green.green, 255);
@@ -29,7 +32,7 @@ mod tests {
     #[test]
     fn tuple_structs() {
         // TODO: Instantiate a tuple struct.
-        // let green =
+        let green = ColorTupleStruct(0, 255, 0);
 
         assert_eq!(green.0, 0);
         assert_eq!(green.1, 255);
@@ -39,7 +42,7 @@ mod tests {
     #[test]
     fn unit_structs() {
         // TODO: Instantiate a unit struct.
-        // let unit_struct =
+        let unit_struct = UnitStruct;
         let message = format!("{unit_struct:?}s are fun!");
 
         assert_eq!(message, "UnitStructs are fun!");
diff --git a/exercises/07_structs/structs2.rs b/exercises/07_structs/structs2.rs
index 79141af9..04c77085 100644
--- a/exercises/07_structs/structs2.rs
+++ b/exercises/07_structs/structs2.rs
@@ -34,7 +34,15 @@ mod tests {
         let order_template = create_order_template();
 
         // TODO: Create your own order using the update syntax and template above!
-        // let your_order =
+        let your_order = Order {
+            name: String::from("Hacker in Rust"),
+            year: 2019,
+            made_by_phone: false,
+            made_by_mobile: false,
+            made_by_email: true,
+            item_number: 123,
+            count: 1,
+        };
 
         assert_eq!(your_order.name, "Hacker in Rust");
         assert_eq!(your_order.year, order_template.year);
diff --git a/exercises/07_structs/structs3.rs b/exercises/07_structs/structs3.rs
index 69e5ced7..2526a1a3 100644
--- a/exercises/07_structs/structs3.rs
+++ b/exercises/07_structs/structs3.rs
@@ -24,14 +24,16 @@ impl Package {
     }
 
     // TODO: Add the correct return type to the function signature.
-    fn is_international(&self) {
+    fn is_international(&self) -> bool {
         // TODO: Read the tests that use this method to find out when a package
         // is considered international.
+        self.sender_country != self.recipient_country
     }
 
     // TODO: Add the correct return type to the function signature.
-    fn get_fees(&self, cents_per_gram: u32) {
+    fn get_fees(&self, cents_per_gram: u32) -> u32 {
         // TODO: Calculate the package's fees.
+        cents_per_gram * self.weight_in_grams
     }
 }
 
diff --git a/exercises/08_enums/enums1.rs b/exercises/08_enums/enums1.rs
index c0d0c308..c45ac7aa 100644
--- a/exercises/08_enums/enums1.rs
+++ b/exercises/08_enums/enums1.rs
@@ -1,6 +1,11 @@
 #[derive(Debug)]
 enum Message {
     // TODO: Define a few types of messages as used below.
+    Resize,
+    Move,
+    Echo,
+    ChangeColor,
+    Quit,
 }
 
 fn main() {
diff --git a/exercises/08_enums/enums2.rs b/exercises/08_enums/enums2.rs
index 29ed1b6f..bf4b8660 100644
--- a/exercises/08_enums/enums2.rs
+++ b/exercises/08_enums/enums2.rs
@@ -9,6 +9,14 @@ struct Point {
 #[derive(Debug)]
 enum Message {
     // TODO: Define the different variants used below.
+    Resize {
+        width: i32,
+        height: i32,
+    },
+    Move(Point),
+    Echo(String),
+    ChangeColor(i32, i32, i32),
+    Quit
 }
 
 impl Message {
diff --git a/exercises/08_enums/enums3.rs b/exercises/08_enums/enums3.rs
index 66c4675f..ada7a38e 100644
--- a/exercises/08_enums/enums3.rs
+++ b/exercises/08_enums/enums3.rs
@@ -4,7 +4,14 @@ struct Point {
 }
 
 enum Message {
-    // TODO: Implement the message variant types based on their usage below.
+    Resize {
+        width: u64,
+        height: u64,
+    },
+    Move(Point),
+    Echo(String),
+    ChangeColor(u8, u8, u8),
+    Quit,
 }
 
 struct State {
@@ -42,6 +49,15 @@ impl State {
     fn process(&mut self, message: Message) {
         // TODO: Create a match expression to process the different message
         // variants using the methods defined above.
+        match message {
+            Message::Resize { width, height } => {
+                self.resize(width, height)
+            }
+            Message::Move(point) => { self.move_position(point) }
+            Message::Echo(msg) => { self.echo(msg) }
+            Message::ChangeColor(red, green, blue) => { self.change_color(red, green, blue) }
+            Message::Quit => { self.quit() }
+        }
     }
 }