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Let's Learn！
litter on the floor
talk loudly in class
We shouldn't litter on
the floor.
Don't litter on the floor.
不应该
We shouldn't talk
loudly in class.
Don't talk loudly
in class.
Let's Learn！
speak with mouth full
make a noise
We shouldn't speak
with mouth full.
Don't speak with
mouth full.
We shouldn't make
a noise.
Don't make a noise.
Let's Learn！
keep quiet
wait in line
We should keep quiet.
we should wait in line.
应该
consolidation: 1、Read and match
litter on the floor
talk loudly in class