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.

他陷入沉思，忘记了时间。

He was deep in ___thought and lost track of time.

她花了很多心思在这份礼物上。

She put a lot of ___thought into this gift.

古希腊思想对西方哲学产生了深远影响。

Ancient Greek ___thought had a profound influence on Western philosophy.