6. «We are still hopeful, everything possible.. (do) now to save the planet,» said the
doctor.
7. A new deposit of oil ..(discover) in the North Sea this year. It
(think) to
be nearly twice the size of the largest existing field.

6. «We are still hopeful, everything possible will be done now to save the planet,» said the doctor.

7. A new deposit of oil has been discovered in the North Sea this year. It is thought to be nearly twice the size of the largest existing field.