四级练习（翻译）
1．The substance does not dissolve in water ________________(不管是否加热)。
2．Not only _______________(他向我收费过高)，but he didnt do a good repair job either.
3.__________(多亏了一系列的新发明), doctors can treat this disease successfully.
4. On average, it is said, visitors spend only _____________________(一半的钱) in a day in Leeds as in London.
5. Many Americans live on credit, and their quality of life _______________(用他们能够
借到多少来衡量的), not how much they can earn.
