III - Convert following active sentences into passive forms.
1. They will open the National Stadium next Sunday.
è _______________________________________________________________.
2. Your manager must write the report.
è _______________________________________________________________.
3. They built this hotel six months ago.
è _______________________________________________________________.
4. They have built two department stores since 2007.
è _______________________________________________________________.
5. You should take these tablets every four hours.
è _______________________________________________________________.