Williamhascuthissmoking_____tofivecigarettesaday.
A、downA
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。
The girl who found the ring received a generous_____of five pounds.
He‘s working hard_____.
If he_____the storekeeper ‘s scissors ，he would have forgotten to buy a pair.
Yourbikeneeds_____.You‘dbetterdoirightnow.
It was not until she had finished all her work_____.
