At the age of 29, Dave was a worker, in a small apartment near Boston and ______ what to do about his future.
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.
4、----“Each of the students, working hard at his or her lessons, _____ to go to university.”----“So do I.”