Ⅰ、smarter , quieter ( , shorter);
finer , later ( , nicer);
thinner , sadder ( , fatter);
funnier , earlier( , heavier);
more outgoing , more serious( , more wonderful)
Ⅱ、1、funny , funnier
2、quieter , quiet
3、smart , smarter
4、serious
5、outgoing
Ⅲ、fast , older , heavier , taller , faster