Re: 5. The boutique was accused of something, therefore the remainder of the sentence describes what they were doing wrong. It is not wrong to charge high prices for quality goods or luxury items. For answer b, we don’t charge prices for “bargains”; bargains refers to the prices themselves. Typically a boutique might claim that their prices are “bargains”, while actually the prices are quite steep, but it wouldn’t be accused of that.
The logical answer to 5 is “rip-offs”; however, there are some problems with this choice.
According to Wikipedia: Ripoff, a “rip-off” means a “knock-off”, or an imitation copy of a well known product. There is “usually no attempt to deceive the buyer or infringe upon brand names, patents, trademarks or copyrights.” Since a “ripoff” or “knockoff” doesn’t try to deceive the buyer, why would the boutique be accused of selling that type of product?
It makes me think that the writer of the test thought that a “ripoff” was the same thing as a “counterfeit”, or perhaps that the writer assumed that in Taiwan, all ripoffs are illegal, so a boutique might be accused of selling such merchandise. If that was a Prada boutique that was selling Prada ripoffs, that would be something to get excited about. I wonder how many ladies would be duped.