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Disposable chopsticks are made of _______________; 2.Materials for making these chopsticks are ________; 3.Disposable chopsticks shouldn’t be ___________; they should be ______; 4.The woman thinks that the production of disposable chopsticks should __________; 5.The woman feels _______ to throw these chopsticks away; 6.They agree that it is necessary to _____________ and everybody should be __________.