___________(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

________(78)
A.well
B.sand
C.water
D.softly

__________(80)
A.catch
B.keep
C.reach
D.aim