Hi LiLi,
Set system-wide hotkeys for previous and next dictations. Mine are F8 for previous dictation and F9 for next dictation. You can also set a system-wide hotkey for marking the currently selected file as done with no reply. This will take it out of the list view and select the next one down if there is one below it in the list, or it will select the last one in the list if the dictation you just marked as done was the last one in the list at the time.