这项研究应能表明这些变革在多大程度上正在得以实施。

The research should show ___the ___extent ___to ___which these changes are being implemented.

相处的时间会影响某人对你产生影响的程度。

Time spent together affects ___the ___extent ___to ___which someone influences you.

很难评估改革在多大程度上改善了环境。

It's hard to assess ___the ___extent ___to ___which the reforms have improved the environment.