87. Our efforts will pay if the results of the research _____________________________.

　　88. I cant boot my computer now. ___________________________ with its operating system.

　　89. Leaving ones job, __________________________________ , is a difficult change, even for those who look forward to retiring.

　　90. ______________________________________, this town is more prosperous and exciting.

　　91. __________________________________ did he realize that he was seriously ill.

　　87. Our efforts will pay if the results of the research can be applied to the research and development of new technology .

　　88. I cant boot my computer now. There must be something wrong with its operating system.

　　89. Leaving ones job, no matter what job it is / whatever job it is , is a difficult change, even for those who look forward to retiring.

　　90. Compared with the place where I grew up , this town is more prosperous and exciting.

　　91. Not until he had finished the mission did he realize that he was seriously ill.