5.By the end of next year, I ______ for the company for 10 years.
A. work
B. am working
C. had worked
D. will have worked
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6.______ arriving at the meeting room, Tina discovered that she had left the sample products in her office.
A. By
B. Through
C. On
D. In
8.Miss Smith's assistant enjoys ______ for her although she treats him very strictly.
A. work
B. working
C. to work
D. worked
9.Tom might not have made such a serious mistake if he ______ your advice.
A. followed
B. follows
C. had followed
D. has followed
10.Jack said the construction of the subway would be completed in October, ______ is a great surprise to us.
A. this
B. what
C. that
D. which