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28.__________the library for hours without finding anything useful, I turned to my professor for help.

A)To search
B)Having searched
C)Have searched
D)Searching

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29.___________some degree,all managers who supervise peoplc are involved in HR activities.

A)On
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30. Our online computer repair and tech support is a convenient way to have your computer___________withouthaving to leave your home.

A)to fix
B)fixing
C)fix
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Section B31. This chapter will assist you in preparing and writing memos that allow you to communicate (effective)_____________in today's workplace.

32. Thank you for your email, and your feedback on the (attach)______________proposal would be appreciated.