第40页

信息发布者：
C
C
A
C
run
play football
go when there is a red man
C
A
D
B
iet
ustn't
oad
afe
ever
rossing
ights
S1: What must we do on the road?
S2: We must look for a zebra crossing and look 
at the traffic lights.
S1: What mustn't we do on the road?
S2: We mustn't run or play on the road.
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