Error recognition

V. Error recognition 
 
12. An old man walking along the road stopped talking to us
13. Mike usually drives to work, but today he walks
14. Hypnosis is sometimes employed as a means of helping people to quit to smoke
15. Despite most mushrooms are edible, some species cause serious poisoning
16. Today we know that the earth is one of nine planets whose orbit the sun
17. Do you want to get up by yourself, or would you like me to wake up you?
18. I bought this new software for learning Chinese                  
19. Are you ready? It’s time we go
20. I’m tired because I’m not used to stay up late
21.  He had his tailor made an exotic oriental-looking robe for opening night.
22. The children were surprised when the teacher had them to close their books unexpectedly.
23. With knowledge gaining from years of working as a telegraph operator, he learned the basics of electricity.
24. Before he retired last month, Mr. Smith has been working as a secretary in the House of Parliament.
25. Chemistry is often called the central science because it connects other sciences together, so as physics, biology or geology.
26. Since there are no tickets left for the concert, they would rather go to the movies than going home.
27. Nutrition plays a key role in maintaining good health and prevent many diseases.
28. What should be done to help the people whose situation forces them destroying grassland?