1. I overheard their secret plan of cheating in the exam by chance / by accident .
2. All the audience were made to laugh by the funny story .
3. Have you made a decision to buy a pet cat ?
4. The cup fell off the table and broke into pieces on the floor .
5. I felt something climbing on my back .
6. Stop day-dreaming in class !
7. Mark has made a decision to visit his grandparents in the countryside .
8. Could you show me how to operate the machine ?
9. A man told me not to take photos in the museum .
10. Some ducks were seen in the river by me .