Answer:
1. You should return the money . . .
1. You ought to return the money . . .
2. Your friends should leave now.
2. Your friends ought to leave now.
3. Everyone should help his friends . . .
3. Everyone ought to help his friends . . .
4. Cynthia should speak to Mr. Brown . . .
4. Cynthia ought to speak to Mr. Brown . . .
5. Mr. Anderson should try . . .
5. Mr. Anderson ought to try . . ,
6. Students should spend time . . .
6. Students ought to spend time . . .
7. You should be a little more careful . . .
7. You ought to be a little more careful . . .
8. Dr. Morris should take a taxi . . .
8. Dr. Morris ought to take a taxi . . .
After you write down what I put the rest of the sentences are the same, which is why I added ellipses at the end of them, because you just write down the second half of the sentences.