这些文件档案被妥善地保管在文件柜中。

These files are kept ___securely in the filing cabinet.

请确保所有的窗户都关紧了，以防有人闯入。

Make sure all the windows are ___securely closed to prevent anyone from breaking in.

请确认所有的窗户都已安全锁好。

Please make sure all the windows are ___securely locked.

他的冠军地位已经稳固确立，无人能动摇。

His championship title is ___securely established, beyond any challenge.