It is heavy traffic和It is a heavy traffic哪一个对

It is heavy traffic和It is a heavy traffic哪一个对 This is a heavy traffic a_______ so heavy traffic 和 such heavy traffic那个对 There is a heavy traffic还是没有a The traffic is heavy改为感叹句 the traffic is 为什么要heavy there is heavy traffic jam.对么 －Oh, the traffic is too heavy. the traffic is heavy.（改为感叹句）_______ _________ traffic! heavy traffic It is raining (heavy). what heavy traffic还是what a heavy traffic