the green valley, we thought we had reached the land.
| A．Seeing, promised | B．Seeing, promising |
| C．Seen, promising | D．Seen, promised |
Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
| A．to do | B．to have done | C．to be doing | D．to have been doing |
—— Have you considered _____ your job as a teacher?
——Yes. I like the job because a teacher is often considered _____ a gardener.
| A．to change; to be | B．to change; being | C．changing; being | D．changing; to be |
The monument was built in honor of the explorer who was believed _____ the river.
| A．to have discovered | B．to have been discovered |
| C．to discover | D．having been discovered |
The monument was built in honor of the explorer who was believed _____ the river.
| A．to have discovered | B．to have been discovered |
| C．to discover | D．having been discovered |
You will see this product made in this factory _____ wherever you go.
| A．to be advertised | B．advertised | C．advertise | D．advertising |