Since when does curiosity begin to lessen in intensity and extent but improve in quality

A．John was disappointed at his math score.
B．John did better than he thought he was able to.
C．John didn’t pass, although he had tried his best.
D．John got an excellent score, which was unexpected.

A．He and Elizabeth argued recently.
B．He’d rather study in his own dormitory.
C．He heard Elizabeth did poorly on the last test.
D．He doesn’t want to bother Elizabeth so late in the evening.