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Lily and Tom are good friends. They are in the same class. Lily has a red bag, but Tom's is blue. Tom has a nice bike, but Lily doesn't have one. Lily wears a yellow skirt today. Tom wears a white shirt. The cute black cat is Lily's. Tom has a little grey (灰色的) dog.
Who bag is it?
— ______
参考词汇:raining, running, dirty, wet...
参考句型:It's...