| 1 | The office mail is opened in the morning. | |
| 2 | Have you ever heard the statement, "open your mind"? | |
| 3 | The switch on this kind of fire extinguisher opens up automatically. | |
| 4 | This agreement opens the door to advances in every field. | |
| 5 | The heavy steel doors mocked the attempts of the thieves to open the safe. |