这棵树去年冬天已经死了。

The tree has been ___dead since last winter.

遥控器没电了，我换上新电池。

The remote control is ___dead, so I'm putting in new batteries.

他完全不懂这个问题，简直是一窍不通。

He's ___dead clueless about this issue.

这种旧的操作系统现在已经完全不能用了。

This old operating system is now completely ___dead.

会议的气氛很沉闷，没人愿意发言。

The meeting was ___dead with no one willing to speak up.