---- Look! Everything here is under construction.
---- Oh, has the building once ___ for exhibition been pulled down, too?
| A．having been built | B．being built | C．to be built | D．built |
The country life he was used to ______ greatly since 1992.
| A．change | B．has changed | C．changing | D．have changed |
The number of people invited ______ fifty, but a number of them _____ absent for different reasons.
| A．were, was | B．was, was | C．was, were | D．were, were |
When and where to go for the on-salary holiday ______ yet.
| A．are not decided | B．have not been decided |
| C．is not being decided | D．has not been decided |
Every possible means ______ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
E-mail, as well as telephone,______ an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．hoped |