Careful listening in class m___ less work later

Careful listening in class m___ less work later Really listening in class means less work after class. teacher's words in class means less work later 这什么意思? How ( )they are listening to the the teacher in class listening to the teacher c___ in class is a good You should _______ in class .Only listening without speaking We do many listening a_________ in our English class W回了 listening in class,you should concertrate____your teache Jim is more careful than _______ in his class. maria is most careful girl in her class 改错 You can't be too careful in your work In class,you should cancentrate your attention ____your less