他陷入沉思，没有注意到时间流逝。

He was deep in ___thought and didn't notice the time passing.

这个突如其来的想法让我停下了脚步。

This sudden ___thought made me stop in my tracks.

她花了很多心思在这份报告上。

She put a lot of ___thought into this report.

她原本打算周末去爬山，但天气不好只好取消。

She had the ___thought of hiking this weekend, but canceled due to bad weather.