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Practice ここ, そこ with video
Video 1

This video is to show the position which ここ、そこ implies, respectively.
Video 2
The lines by the male are not audible, but you can see the cues in English. Practice saying the male lines.

Video 3

This is the hardest. You can hardly hear the lines by the male. Also the written cues are minimal. Use the visual cues as much as possible and say the lines on your own.