=>
31. know -> known
32. listening -> listen
33. didn't stop -> stopped
34. interesting -> interested
35. It was not until they have to find a job that they learned English.
36. I hope to receive your reply.
37. This is the most exciting story I have ever heard.
38. If you hadn't ignored my advice, you wouldn't have got into trouble. 

Tìm lỗi sai và sửa :

31/ know sửa thành known
32/ listening sửa thành listen
33/ didn't stop sửa thành stopped
34/ interesting sửa thành interested

Rewrite

35/ It was not until they have to find a job that they learned English
36/ I hope to receive your reply
37/ This is the most exciting story i have ever heard
38/ If you hadn't ignored my advice , you wouldn't have got into trouble