他们向组织者表达了感谢。

They expressed their ___thanks to the organisers.

他给医院写了一封感谢信。

He wrote a letter of ___thanks to the hospital.

也要感谢你的妻子，我们真的很喜欢她做的美味佳肴。

Give ___thanks also to your wife, we really appreciate her marvellous cooking.