3. the teacher asks the students if the students will be reading seems to be about nothing (The Amazon River), teacher to student, guess that's why ' The biggest river ' refers to the Amazon River.
3. The teacher asked The students will read Probably about nothing (The Amazon River), then the students guess why 'The biggest river' means the Amazon River.
3. Teachers ask students what about students read should be about anything (The Amazon River) then the teacher the students guess why. "The biggest river" is meant to แม่น้ำอะเมซอน.