Williamhascuthissmoking_____tofivecigarettesaday.
A
cut down “削减，减少 ”;cut sth. down to “ 把⋯⋯ 减到(什么程度) ”，是固定搭配，而且符合题意。
Beingextremely_____tothecold，Idonotlikeskating.
Yourbikeneeds_____.You‘dbetterdoirightnow.
Thereisn‘tmuchmilk_____isleftinthebottle.
“Itwasverycoldtesterday.”
“_____.”
_____alltherepresentativesstillnotthere，themeetingwaspostponedforseveralhours.
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