Last night he worked until late. _____, he had to walk home in the dark.
people who often stay up too late are more likely to die of heart disease, ___________a study.
The computer system _________suddenly while he was searching for information on the Internet.
Would you please keep silent? The weather report__________, and I want to listen.
Mr Smith, _________ of the ___________speech, started to read a novel.
The teacher was angry about his being late for class, but he behaved ______ nothing had happened.