习题：

　　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 didn’t do a good repair job.
　　3. Your losses in trade this year are nothing _____ (与我相比).
　　4. On average, it is said, visitors spend only_____ (一半的钱) in a day in Leeds as in London.
　　5. By contrast, American mothers were more likely _____ (把孩子的成功归因于) natural talent.
　　

　　答案：
　　1. whether (it is) heated or not
　　2. did he charge me too much
　　3. compared with mine
　　4. half as much (money)
　　5. to attribute their children’s success to