1.In fact, the four tourists say they were ripped off (overcharged) for their meal.
rip off 宰客;欺诈
The lack of a meter allow drivers to rip off passengers.
出租车不装计程器使司机得以宰客 。
2.One tourism group tweeted: "Whoever puts the good name of Venice at risk, harms all Venetians."
put at risk 使处于危险境地
The second option would put us at a risk, but perhaps more of an opportunity.
第二个方案会使我们担风险,但同时也许更是一个机遇 。