31. did - was
32. release - released
33. was happened - happened
34. are manufacturering - are manufactured
35. to believing - to believe
36. be doing - be done
37. to blew - blewing
38. in work - work
39. keep - kept
Câu 37 Begin, start đi được với V-ing thì phải, sai chắc chỗ to blew, thành to blow, hay blowing luôn.
Câu 40 mình không rõ tại sao sai gì, chỉ nghĩ nên bỏ s chỗ kind đi thôi.