Change these active sentences into the passive so that they sound more natural.
1. Somebody opened the Channel Tunnel in 1994.
Exm - The Channel Tunnel was opened in 1994.
2 They have chosen the new design.
3 Thousands of people see this website every day.
4 The employers asked the staff for their opinions.
5 A mechanic is repairing my car at the moment.
6 Somebody has found the missing file.
7 Somebody made this watch in Switzerland.