单元：List-15.txt

• both
• express
• trip
• write
• inform
• academic
• trouble
• meanwhile
• go
• order
• homeland
• used
• connect
• by
• experience
• personally
• somebody
• suggest
• work
• plan
• speech
• undertake
• recommend
• attractive
• weight
• believe
• fight
• pass
• build
• behind
• manner
• quite
• instruction
• behaviour
• apologize
• excellent
• kind
• claw
• gesture