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1) The blackboard and chalk _______________. 2) The book _______________. 3) Computer models _______________. 4) When the bill of fare was brought, _______________. 5) _______________to eliminate sandy storms. 1) is being replaced by the computer and the projector 2) will have been published by the end of this year 3) can be used to demonstrate the way that cells work 4) I was startled, for the prices were a great deal higher than I had anticipated 5) Effective measures must be taken immediately | 
