Among Asimov’s most famous works of science fiction, one ______he won an award, was the Foundation Trilogy.
| A．of whom | B．of which | C．for whom | D．for which |
9、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 |
8、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 |
7、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 |
6、Books of this kind ______ well.
| A．sell | B．sells | C．are sold | D．is sold |
5、E-mail, as well as telephone, ______ an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．Hoped |