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Directions: For each blank in the following passage, there are four choices marked A, B, C and ...

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near    upon    within    around  
covering    covered    cover    to cover  
routers  stations  servers  switches  
/ ; /    the ; /    the ; the    a ; the  
A.of    to    for    about  
routers  stations  servers  switches  
along    in    from    across  
The Weekly Edition for the last week of each month  The Annual Summary of Notice to Mariners  The new supplement  The Weekly Edition"  
has    is    have    are  
what    that    which    How  
to    for    by    about  
made by hand  consulted with at the last week of each month  stuck in the parent book or current supplement  kept in a file with the latest list of corrections in force on top"  
Directions: Beneath each of the following sentences there are four choices marked A, B, C, and D. Choose the one answer that best completes the sentencE. 21. ________caused the accident is still a mystery. A. How    What    That    Where