频繁的网络故障让他无法完成在线作业，这让他非常沮丧。

The constant internet issues ___prevented him from finishing his online assignment.

频繁的网络问题让我们的在线会议计划泡汤了。

Constant internet issues ___frustrated our plans for an online meeting.

他因为电脑频繁死机而感到非常沮丧。

He felt extremely ___frustrated when his computer kept crashing.