Rewrite the sentences so that they are passive. Help

Начало предложений в задании.

2. have been tested by scientists for a cure for cancer.

3. are being destroyed by people every day.

4. from fog poison is being developed by scientists.

5. have been gained by scientists into some of the rainforests' secret.

6. new medications will be developed by scientists in the future to help people with cancer.

7. was made by German scientist into a modern medicine in 1897.