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Cycling is a good exercise.（）, it doesn't pollute the air.

A.Therefore
B.However
C.Moreover
D.But

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They were asked to avoid（）any water which had not been boiled.

A.drinking
B.not to be drunk
C.to drink
D.having

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These radio and TV networks have（）in the UK

A.large watchers
B.large viewers
C.big listeners
D.huge audiences