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As for no. 21, the top is clearly Liu SW, the bottom is more difficult, but I can tell enough she is not LSW. Same shirt eh... a left-hander of her generation.... hmm... Once I got to this point she looked more and more like Ding N.
No. 22 Zhang YN
No. 25 girls from left to right LSW, ?, Hou XX, Fan YL, Ding N. For boys I can only recognize Ma Long rightmost, may be XX 3rd from right.
Right about No. 22 ZYN and No. 25. Liu Shiwen, Feng YL, Ding Ning, Ma Long.
Based on your track record, I'm little surprised that you failed to recognize the boy next to Ma Long.