单元：Module 04.txt

• chalk
• ruler
• carry
• change
• everything
• future
• life
• need
• will
• maybe
• ask
• question
• by
• level
• able
• more
• free
• air
• land
• machine
• rain
• robot
• sea
• space
• traffic
• jam
• traffic jam
• wind
• true
• here is
• bike
• car
• cheap
• everywhere
• not only but also
• into
• long
• heavy
• light
• easy
• working
• hour
• short
• rise
• as well