急,the demo class is the only factor to ---if we will get the

急,the demo class is the only factor to ---if we will get the student.
横线处填什么?我想说决定,但是 deceide听着好像不大对劲啊.这个“决定”该用哪个词语啊
demo class 是决定我们能否得到学生的关键