1.In fact, the four tourists say they were ripped off (overcharged) for their meal.
rip off 宰客;欺詐
The lack of a meter allow drivers to rip off passengers.
出租車不裝計程器使司機得以宰客 。
2.One tourism group tweeted: "Whoever puts the good name of Venice at risk, harms all Venetians."
put at risk 使處于危險境地
The second option would put us at a risk, but perhaps more of an opportunity.
第二個方案會使我們擔風險,但同時也許更是一個機遇 。