6.directory
　　If you need to speak to him,you can use the office directory and look up
　　his personal extension.
　　Explanation:
　　n. an alphabetical or classified list of names and addresses.
　　7.duplicate
　　Please don‘t bring a duplicate,since I will need to see your original birth
　　certificate for this passport.
　　Explanation:
　　n. an identical copy ;
　　v. to make an identical copy of ;to replicate
　　8.filing
　　Developed in the early 1900‘s,the Dewey Decimal System is a filing
　　system still used by libraries today.
　　Explanation:
　　n. putting in useful order;cataloguing
　　9.in-tray
　　The more Dennis procrastinated,the more the stack of paperwork in his
　　in-tray resembled the Rocky Mountains.
　　Explanation:
　　n. a flat,shallow container used for holding items that are to be
　　accomplished
　　10.monitor
　　Seismic readouts are carefully monitored by seismologists,who are
　　always on the lookout for the next big earthquake
　　Explanation:
　　v. to watch ,or keep track of ,often by means of an electronic device