A.Because they need to use the plane.B.Because they have to repair the engine.
A. Because they need to use the plane.
Because they have to repair the engine.
C. Because they want to save the cost.
D. Because they dont have the permit to fly.
A.Her professor．B.A classmate．C.Her former boss．D.A foreign dip
A. Her professor．
B. A classmate．
C. Her former boss．
D. A foreign diplomat．
A.It is useful.B.It is boring.C.It is special.D.It is popular.
A. It is useful.
B. It is boring.
C. It is special.
D. It is popular.
A.A trial piece of equipment of an airplane.B.A temporary substitute for a spare
A trial piece of equipment of an airplane.
B. A temporary substitute for a spare part.
C. A temporary renting of a piece of equipment.
D. The maintenance of some parts of a plane.
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