The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
What _____ time it is to listen to a speech having nothing to do with you!
The room is very large and only little room _____ by the new piano.
The task was very hard, so _____ were needed.
The college entrance examination is coming, the students are _____ it.
This is the school _____ they visited last year and is the one _____ my father once worked.