[originaltext]German carmaker Volkswagen has posted its first drop in VW brand

German carmaker Volkswagen has posted its first drop in VW brand sales in 11 years as the company continues to cope with its emissions scandal.
Sales of VW brand cars fell 4.8% in 2015 to 5.82 million cars from 6.2 million a year earlier. Falling demand in China and US added to the losses as orders fell in December. VW has promised it will have a fix in the coming weeks for the millions of US cars with defeated devices that disguised emission levels in diesel cars.
Sales began declining after the scandal came to light in September. Deliveries fell 5.3% in October, 2.4% in November and 7.9% in December compared with those months the previous year. The underperformance at VW’s largest division by sales and revenue pulled down annual group deliveries by 2% to 9.93 million cars, the first drop in 13 years, VW said.
However, speaking on Wednesday, Volkswagen chief executive Herbert Diess said he was "optimistic" the company would find a solution soon. Regulators appear been less confident. The Environmental Protection Agency (EPA) which uncovered the scandal, said on Monday that VW had not yet "not produced an acceptable way forward".
Question 5 to 7 are based on the news report you have just heard.
5. What change took place in Volkswagen recently?
6. What helped bring about the change?
7. Why are the regulators not confident about VW?