Ⅰ、tall ， shorter ， popular ，
faster ， quiet ， funny ，
playing computer games ，
more clearly
Ⅱ、One possible version：
In my opinion ， Ann is the right person for the English monitor of our class. She is quiet and serious. And she is always a good listener. Gina works hard ， but Ann is the most hardworking. We all like her. What's more ， Ann likes English. She is better at English than anyone else in our class. She speaks English pretty clearly and beautifully. She usually gets to school early to help with collecting the English exercise books. She is really helpful to both the English teacher and us students.