1. 单句改错

1. （1） He was touched by the warm of their welcome.
3. （2） The necklace that she lost is of great valuable.
5. （3） The three-legged chair isn't suitable to a young child.
7. （4） John is so active that he usually take part in many school activities.
9. （5） We have been prepared to do whichever it takes to save her life.
11. （6） Not only is a cell phone a useful tool, but also is a way to have fun.
13. （7） It suddenly occurred to him which he had left his keys in the office.
15. （8） She always associated the smell of fresh bread to her grandmother, who loved baking.
17. （9） He thought what mattered most in improving your speaking English was enough confidence and practice.
19. （10） The boss together with his assistants is go to attend the important meeting.