应对任务英语

task还有使命的意思，assignment是一般的用法，可以说布置的作业等。

紧急任务 翻译为：urgent task ;

assignment;mission;task;duties;job这些全表示任务

You should be confident in the ability to complete this task...也可以这样说吧！！！

mission

You should be sure to complete the task by your self.You aught to believe you can finish it by your self.