Her name's Betty .She c【comes】from America .She likes her school and her s【subjects 科目,课程】.She has many p【projects 项目,课题】to do .She often g【goes】on a field t【trip】.She s【studies 研究】birds in the f【forest】.She also likes studying a f【farmer's】 work in farm .And she always p【protects 保护】trees and f【flowers】on the a【actual 实际的】 field trip.
此文一点都没有谈及Betty的学生,也没有信息说她是教师,因此第二空填subjects比填students更合适.
go on a field trip 野外实习,野外考查.
根据She also likes studying 可知,应是studies birds而不是surveys birds;
a是修饰farmer的,不是修饰work的,因为work是不可数名词,不能同a连用.