.The Internet __________ of great value to us during our project.A was proved B proved C was proving D was being proved
The island, ___ to the mainland by a bridge, is easy to go to.
If you ___ smoke, please go outside.
I wasn’t sure if he was really interested or if he ___ polite.
As he reached ___ front door, Jack saw ___ strange sight.
What would have happened, ___, as far as the river bank?