当看到这个有利可图的投资机会时，她毫不犹豫。

When presented with the lucrative investment opportunity, she ___didn't ___think ___twice.

这个旅行套餐太好了，我毫不犹豫地立即预订了。

The travel deal was so good that I ___didn't ___think ___twice about booking it immediately.

看到孩子身处险境，他不假思索地跳进河里施救。

Seeing the child in danger, he ___didn't ___think ___twice before jumping into the river to help.