write sentences in the passive

1. Photographs can be taken at the wildlife park.
2. Free T-shirts will be given with all donations over 20 next week.
3. The Amazon Rainforest is visited by many tourists every year.
4. Martin is being interviewed on the radio as we speak. (?)
5. A new campaign has just been launched in order to protect great white sharks.
6. Walking boots must be worn by hikers.
7. The beach is being cleaned by the environmental group now.