Unit 1FogFog warningWhen Polly left home that morning, the city was already covered in a grey mist. At lunch, the radio forecast that the mist would become a thick fog in the afternoon. At four oclock, Polly left work and stepped out into the fog .She wondered if the buses would still be running.No buses to King StreetOnce out in the street, she walked quickly towards her usual bus stop.How far are you going? the bus conductor asked her before he took her fare.King Street. sai