dogged

那个侦探连续几天紧跟着嫌疑人。

The detective ___dogged the suspect for several days.

记者们紧跟明星，想获取第一手新闻。

The reporters ___dogged the celebrity to get the first-hand news.

尽管困难重重，他仍然坚持不懈地完成了这项任务。

Despite all the challenges, his ___dogged persistence helped him finish the task.