Students use the difference of how to vote as an aid in selecting the answer he used observations from the mouth of the trainer and feel the difference while vote manually.
Students use a different method of voting as an aid in selecting answers. He used observations from the mouth of the trainer and feel the difference in their vote.
Students use the difference of the way to pronounce a help in choosing the answer. He used to observe the จากปากขอ D trainer and feel the difference as pronounced by themselves.