Kishore Kumar did not sing many sad songs but all those that he sang have been immensely liked by music lovers ...some of them
1, Aaj Rona pada toh samjhe hasne ka mol kya hai
2, Koyi lautade mere beete hue din
3, Dukhi man mera sun mera kehna
4,Yeh kya hua kaise hua
5, Koyi humdum naa raha
6, Manzilen apni jagah mein
7, Agar sun le to ek nagma
I like most of the songs that you have listed here, save for song no. 1 and 7, which I haven't heard.
Here are the youtube videos of those two songs ...Aaj rona pada from the film 'Girlfriend' and Agar sun le from 'Ek Raaz'...
https://www.youtube.com/watch?v=Ja2QMYU4eQU
https://www.youtube.com/watch?v=alHItUt_yug