接上：her name's betty . she c() from america . she likes her s

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。