diff --git a/src/contents/0.en.tsx b/src/contents/0.en.tsx
index f6b00de8d..c86b2f203 100644
--- a/src/contents/0.en.tsx
+++ b/src/contents/0.en.tsx
@@ -57,7 +57,7 @@ export default () => (
             <R.Mcug>
               You’ll see puzzles like this:
               <br />
-              Try pressing <H args={{ name: 'run' }} />!
+              Try pressing <H args={{ name: 'run' }} />.
             </R.Mcug>
           </>
         )
@@ -122,14 +122,14 @@ export default () => (
               <Emoji>😁</Emoji>{' '}
               <Bold>If you want to get started as soon as possible:</Bold>{' '}
               <Highlight>
-                Press the button below to go to the next page!
+                Press the button below to go to the next page.
               </Highlight>
             </P>
             <NextLessonButton />
             <P>
               <Emoji>🤔</Emoji>{' '}
               <Bold>If you want to read the introduction</Bold> before you get
-              started, <Highlight>scroll down and keep reading!</Highlight> The
+              started, <Highlight>scroll down and keep reading.</Highlight> The
               introduction should take only a few minutes to read.
             </P>
             <EmojiSeparator
@@ -138,7 +138,7 @@ export default () => (
                 <CustomEmoji type="singleArrowDown" />,
                 <CustomEmoji type="singleArrowDown" />
               ]}
-              topDescription={<>Scroll down to read the introduction!</>}
+              topDescription={<>Scroll down to read the introduction</>}
             />
           </>
         )
@@ -261,7 +261,7 @@ export default () => (
               </Highlight>{' '}
               <Emoji>😉</Emoji>
             </P>
-            <P>Let’s now talk about this course!</P>
+            <P>Let’s now talk about this course.</P>
           </>
         )
       },
@@ -423,14 +423,14 @@ export default () => (
                 <ExternalLink href={githubRepo}>
                   the source is available on GitHub
                 </ExternalLink>
-                . Please ★ star it! <Emoji>😉</Emoji>
+                . I’d appreciate it if you could ★ star it. <Emoji>😉</Emoji>
               </P>
             </CardContent>
           )
         }
       },
       {
-        title: <>Let’s get started!</>,
+        title: <>Let’s get started</>,
         content: (
           <>
             <P>
@@ -444,7 +444,7 @@ export default () => (
                 <>
                   Learn Y Combinator using puzzles.
                   <br />
-                  No programming involved!
+                  No programming involved.
                 </>
               }
             />
@@ -452,7 +452,7 @@ export default () => (
               <Bold>Let’s get started</Bold> and take a look at what the puzzles
               look like.{' '}
               <Highlight>
-                Press the button below to go to the next page!
+                Press the button below to go to the next page.
               </Highlight>
             </P>
             <NextLessonButton />
diff --git a/src/contents/1.en.tsx b/src/contents/1.en.tsx
index 1022e7be2..ed7b92fc3 100644
--- a/src/contents/1.en.tsx
+++ b/src/contents/1.en.tsx
@@ -465,7 +465,7 @@ export default () => (
                 </>
               }
             />
-            <P>The villagers couldn’t live without mathboxes!</P>
+            <P>The villagers couldn’t live without mathboxes.</P>
           </>
         ),
         footer: {
@@ -509,10 +509,7 @@ export default () => (
               ]}
               description={<>A mathbox has one more feature…</>}
             />
-            <P>
-              We’ll talk about this third feature on the next page!{' '}
-              <Emoji>🤗</Emoji>
-            </P>
+            <P>Let’s talk about this third feature on the next page.</P>
             <NextLessonButton />
           </>
         )
diff --git a/src/contents/2.en.tsx b/src/contents/2.en.tsx
index 280094c7a..2a536d2b6 100644
--- a/src/contents/2.en.tsx
+++ b/src/contents/2.en.tsx
@@ -75,7 +75,7 @@ export const Conclusion = () => (
           />
           , we can do
           <br />
-          additions and subtractions accurately!
+          additions and subtractions accurately
         </>
       }
     />
@@ -177,11 +177,11 @@ export default () => (
                 .
               </Bold>{' '}
               It doesn’t matter if you get it right or wrong, so don’t worry too
-              much!
+              much.
             </P>
             <EmojiSeparator
               emojis={['👍', '🤔', '👎']}
-              description={<>We’ll do a Yes/No quiz!</>}
+              description={<>We’ll do a Yes/No quiz</>}
             />
             <P>
               The villagers living in Lambda Village were all bad at math, so
@@ -553,7 +553,7 @@ export default () => (
                 <>
                   We are bad at math,
                   <br />
-                  so we can’t live without mathboxes!
+                  so we can’t live without mathboxes.
                 </>
               }
             />
@@ -563,9 +563,9 @@ export default () => (
             </P>
             <EmojiSeparator
               emojis={['🌲', '😭', '❓', '😭', '🌲']}
-              description={<>Something terrible happened!</>}
+              description={<>Something terrible happened</>}
             />
-            <P>We’ll talk about it on the next page!</P>
+            <P>We’ll talk about it on the next page.</P>
             <NextLessonButton />
           </>
         )