根据短文内容，用括号内所给动词的适当形式填空，必要时可加助动词或情态动词．

A special red bridge was found in the Lake District，Britain．The whole bridge used no glue or bolts （螺钉）．It was completely made of paper!

The bridge was a piece of art work．It（64）　　（start）to open to the public in April.2015．The bridge was made of 22，000 pieces of paper and it（65）　　 （be）five meters long．

The bridge became a popular tourist place．The tourists wanted to test whether it would hold their weight．"The red bridge really（66）　　 （stand）out in the wild countryside and makes you（67）　　（want） to touch it or even walk over it，"said a visitor．

The special paper bridge was an art project by an environmental artist named Steve Messam．To build the paper bridge was not easy at all，and he spent three years （68）　　（develop）the bridge．He used old principles（原理）from Roman times （69）　　（build）it．He said the 4.5 tons of paper made the bridge much stronger than oak（橡木）．Even after heavy rain，the bridge wasn't influenced at all．

The paper（70）　　（produce） by a paper factory．After the exhibition （展览）．all the paper was recycled．