18.( 1) The little girl asked on the No.5 bus.
(2) "I" helped the little girl pay for the ticket when she had no money to buy it.
The little girl came back at the bus stop.
19. Psychology: I am grateful for help, but also embarrassed to accept charity.
Personality: Honest and trustworthy. Unwilling to be given alms for no reason.
20. Honesty.
2 1. When the little girl didn't have the money to take the bus, you warmly extended a helping hand, which showed that you were a kind person with great love, and it was enough to prove that you didn't deliberately avoid the one-yuan ticket. Everyone makes mistakes, and those who can immediately realize their mistakes and deeply reflect and blame themselves should be respected.