Exe 4. 

a, in/at

b, of/of

c, after

Exe 5. 

46. worst → worse

47. bỏ them

48. no → any

49. were → was

50. tomorrow → the following day

III.

51. ago

52. because

53. different

54. what

55. writes

56. there

57. all

#No_copy

#Cow_deeptry

`~rai~`

$\begin{array}{I}4.\\\text{a.In/at(In my opinion:Trong suy nghĩ của tôi,at least:ít nhất)}\\\text{b.for/of(be ashamed for:xấu hổ về/be proud of:tự hào về)}\\\text{c.after(take after:giống)}\\5.\\\text{46.worst->worse}\\\text{47.them->bỏ}\\\text{48.hardly->bỏ}\\\text{49.were->was}\\\text{50.tomorrow->the next day}\\III.\\\text{51.ago}\\\text{52.although}\\\text{53.diferent}\\\text{54.what}\\\text{55.are}\\\text{56.there}\\\text{57.that}\end{array}$