Turn off all the lights before going out.
A.All the lights must be turned in before going out.
B.All the lights must be turned on before going out.
C.All the lights must be turned off before going out.
D.All the lights must be turned over before going out.

I would prefer you to deliver the sofa on Saturday.
A.I would rather you delivering the sofa on Saturday.
B.I would rather you should deliver the sofa on Saturday.
C.I would rather you to deliver the sofa on Saturday.
D.I would rather you deliver the sofa on Saturday.

___________(82)
A.difficult
B.effective
C.available
D.valuable

________(84)
A.electricity
B.source
C.fuel
D.power

__________(86)
A.water-heat
B.water-heating
C.heat-water
D.heat-watering

________(87)
A.for
B.at
C.from
D.by

___________(89)
A.supply
B.lack
C.need
D.response

What is not mentioned in the description of the author's hometown?
A.Waterwheels produce beautiful folk songs
B.It is near a rive
C.You can go there on foot
D.It is near a mountain

_________(75)
A.banks
B.machine
C.office
D.company

_________(77)
A.in front of
B.under
C.on
D.behind