整场讲座我都心不在焉，一直想着我的假期计划。

I ___was ___in ___a ___dream during the entire lecture, thinking about my holiday plans.

现在别跟他说话——他看起来心不在焉，你说什么他都听不进去。

Don't talk to him now—he seems to ___be ___in ___a ___dream and won't hear a word you say.

她开车时完全在走神，差点错过了出口。

She was driving on autopilot, completely ___in ___a ___dream, and nearly missed her exit.