第一个 The problem now 是主语 is谓语 that water levels in all rivers and lakes have fallen dangerously low and从句
in some cases 主语 are well below the intake pipes 谓语加上宾语
which feed into the pipelines which supply the cooling towers.是定语从句
Numerous other commercial enterprises是主语 from theaters to magazine publishers,from gas and electric utilities to milk processors是定语
bring better and more efficient services to consumers through the use of computers.是谓语加上宾语