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Practice Reading: Fill in The Blanks (Drag & Drop) ID: #50523 Tunnel Excavation
Instructions
* Drag the correct answer into all target fields
Due  to  the  lack  of  living  space  and  the  increase  in  population,  there  has  been  a  construction    in  the  underground  space  to  improve  the  quality  of  human  life.  In  recent  decades,    tunnelling  techniques,  particularly  tunnel  boring  machines,  have  been  extensively    to  tunnel  construction  due  to  their  high  excavation    and  low  total  cost  for  the  excavation  of  long  tunnels.

expected prosperity applied mechanized ratio boom rate

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