4.Read the following passage carefully and answer the following questions 
           Hello.My name is Vinh .I'm thirteen years old.This year I'm in grade six.This is my school .It is small but very beutiful.There are twenty clasrooms in my school .My classroom is on the second floon.There are twenty-five boys and fifteen girls in my class.There í a rice paddy near my school
1.Which grade is Vinh in?
2.How many students are there in Vinh s' class?