Medals anyone?

Which single word can fill each of these gapped sentences?

'The film was so gripping that it .............. my interest from start to finish.'

'She once .............. some shares in the company but now they are worthless.'

'Police .............. the man suspected of murder for further questioning.'

Thanks for the invitation... I wish I could take part in your classes this year...

Cheers,

Fellipe FCS.