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Researchers from the Massachusetts Institute of Technology have [discover / found] the gene that could help people forget traumatic experiences. They say the research could [beneficial / benefit] people with painful memories. Soldiers, crime victims and people who [survivor / survived] natural disasters are [some / much] of the people this research could help. Many of [that / these] people suffer from very bad stress because of their [memorise / memories] . It is an [illness / ill] called post-traumatic stress disorder (PTSD). The scientists found the memory gene [on / in] mice. They hope that one day they can erase painful memories in humans. They think they can replace [upsets / upsetting] memories with more positive thoughts and feelings. This would help millions of people who [suffering / suffer] from PTSD.

The head researcher, Li-Huei Tsai, did many [testing / tests] to make mice forget their [fear / afraid] . Scientists put the mice into a cage and gave them a small electric [sock / shock] . After many shocks, the mice became afraid of the cage. They were [stress / stressed] when they saw it. [Once / Twice] the mice had "cage shock," the scientists put the mice [in / on] the cage again but didn't give them an electric shock. After a period [for / of] time, the mice no longer feared the cage. Positive feelings [replaced / replacement] their stress and fear. The scientists looked at the brain activity when the mice were afraid and when they were not afraid. They were [surprises / surprised] to find the gene that replaced old memories with new ones. They will now try to find this gene [in / on] humans.