It hasn’t been ______ that food from cloned animals is really safe for humans to eat.
| A．confirmed | B．considered |
| C．turned out | D．proved |
He is the only one of the students who _____ a winner of scholarship for three years.
| A．is | B．are |
| C．have been | D．has been |
The Smith’s family, which ____ rather a large one, ____ very fond of their old houses.
| A．were, were | B．was, was |
| C．were, was | D．was, were |
When and where to build the new factory _____ yet.
| A．is not decided | B．are not decided |
| C．has not decided | D．have not decided |
All but one ______ here just now.
| A．is | B．was | C．has been | D．were |
Eric is the only one of the boys who _____ a driving license.
| A．has | B．have |
| C．is having | D．are having’ |