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1. It was essential that _______________(我们在月底前签订合同). 2. _______________(家庭人口多好还是人口少好)is a very popular topic，which is often talked about not only by city residents but by farmers as well. 3. We must _____________(用一切可能的办法来帮助他们). 4. We ________________(尽情地吃了一顿)at the new restaurant last Friday. 5. To most of the travelers，________________(衣、食、住、行)are all important elements. | 
