18（）
A. Why
B. How
C. When
D. Where
10（）
A. disappointment
B. joy
C. sorrow
D. surprise
What is the advantage for passengers who travel in a group of ten or more（）
A. They may buy the tickets direct from the on-board staff.
B. They will not pay for booking service.
C. They may get a discount.
D. They can pay in cash.
12（）
A. .a
B. one
C. some
D. the
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