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 We  need the biggest pumpkin

Robin:  We   must   buy   things   for   our   Halloween   party .  We  need a pumpkin. 
Misha: Is this pumpkin OK?
Robin: No, we need a bigger pumpkin. We need the biggest pumpkin in the shop. And we need crayons and paints. 
Misha: These are good.
Robin: No, we need better crayons and paints. We need the best crayons and paints in the shop. And we need long candles. 
Misha: Here you are.
Robin: No,  we  need longer candles.  We  need the longest candles in the shop. And  we  need cool masks and costumes. 
Misha: These masks and costumes are very cool. 
Robin: Oh, yes. Look at that mask! It has a very bad face! It is the worst face in the shop!  We  need it!