急填介词1.My brother is _____the top or the list _____the class

急
填介词
1.My brother is _____the top or the list _____the class while I am ___Number 7
2._____example,____nine years ,China increased life expectancy ____13 years
3.They are ____the five richest countries ____ the world
4.Is he going to agree ____the suggestion?
5.We couldn't agree ____a date when to meet
6.Seeds develop _____plants