单项选择题

A．When the plane is in danger.
B．During test flights in the air.
C．When all the engines suddenly go wrong.
D．During test flights in the lab.
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单项选择题
A．In the living room.B．In the bedroom.C．In the garden.D．In the garage.
A．In the living room.
B．In the bedroom.
C．In the garden.
D．In the garage.
单项选择题
A．Make posters.B．Write a speech.C．Answer questions.D．Study chemistry.
A．Make posters.
B．Write a speech.
C．Answer questions.
D．Study chemistry.
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