Direction: You are going to read a text about the Mars rover. Some sentences are missing from the text. Choose from the list (A-C) the most appropriate sentences to complete the text. There is also an extra sentence that you do not need to use.

1)________. The ExosMars Trace Gas Orbiter, which is operated by the European Space Agency and Russia’s Roscosmos, detected unusually high quantities of hydrogen beneath the surface of the Valles Marineris canyon system. 2_______.

A. The orbiter is equipped with its Fine Resolution Epithermal Neutron Detector (FREND), which is able to detect hydrogen in the top meter of the planet’s soil. 

B. Igor Mitrofanov, principal investigator of the FREND telescope, said in a statement. 

C. An orbiter circling Mars has spotted “significant amounts of water” in a formation of canyons often referred to as the Red Planet’s Grand Canyon.