Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: China will begin work on the world's largest super-collider in 2020, a mega-machine aimed at increasing understanding of the elusive Higgs boson, state-run media reported Thursday. The facility, designed to smash subatomic particles together at enormous speed, will reportedly be at least twice the size of Europe's physics lab, the Swiss-based CERN, where the Higgs boson was discovered. Scientists believe the Higgs -- sometimes dubbed the 'God particle' -- endows mass, making it a fundamental building block of the universe. The final concept design for the project is on track for completion by the end of 2016, Wang Yifang, director of the Institute of High Energy Physics at the China Academy of Sciences, told the China Daily.China will begin work on the world's largest super-collider in 2020Will be at least twice the size of Europe's physics lab CERN 
 Question:'The LHC already delivers proton collisions at the highest energy ever,' _ chief Rolf Heuer said in a statement.

CERN