那个城市缺少可供居民消磨时间的公园，在旧城改造时应相应地增加绿色空间。(lack)

The city lacks parks where residents can spend their leisure time, so more green spaces should be added accordingly during the old town renovation.

考查名词、定语从句、动词短语和介词短语。根据句意以及句子的提示词可知，表示 “那个城市” 为名词The city；表示 “缺少” 为动词lacks；表示 “公园” 为名词parks；后接关系副词where引导的定语从句对parks的修饰，在该定语从句中，表示 “可供居民消磨时间” 可译为where residents can spend their leisure time；表示 “更多绿色空间” 应为名词短语more green spaces；表示 “应相应地增加” 应为动词短语should be added accordingly；表示 “在旧城改造时” 应为介词短语during the old town renovation。故翻译为：“The city lacks parks where residents can spend their leisure time, so more green spaces should be added accordingly during the old town renovation.”。