Lucy has a great sense of humour and always keeps her colleagues ______ with her stories.
9、The number of people invited ______ fifty, but a number of them _____ absent for different reasons.
8、When and where to go for the on-salary holiday ______ yet.
7、Every possible means ______ to prevent the air pollution, but the sky is still not clear.
6、Books of this kind ______ well.
5、E-mail, as well as telephone, ______ an important part in daily communication.