这本书为学习英语提供了宝贵的建议。

This book provides valuable ___hints for learning English.

她正在写下一些关于园艺的有用提示。

She is writing down some helpful ___hints about gardening.

你能给我一个如何解决这个谜题的提示吗？

Can you give me a ___hint on how to solve this puzzle?