1.She has bought that new car since 2000.
2.Diego Maradona played wonderfully, so we are proud of him.
3.A passage is written in English by your son,isn't it?
4.No other mountain in the world is as magnificent as Mount Everest.
5.My close friend is the hardest student in the office.
6.Two years ago, the factory didn't put out as many products as now.