46. that => who

47. where => that

48. goes => who goes

49. who => that

51. careful => carefully, use => using

55. have to => should

@Em Trai Mưa(⌣_⌣”)#:

46. It was the children that were frightened by her.
47. It was in this shop where I bought this dictionary.
48. It is my closest friend who goes abroad to study next week.
49. It was the cat that the boy hit.
50. We all know that we have to work hard to support the family.
51. Read the instructions carefully before using it.
52. The cake sounds delicious. Who made it?
53. To maintain lifelong friends, you should care about your friends' feelings.
54. The government really must do something about unemployment.
55. We didn't have to drive fast; there is a speed limit here.

Em Trai Mưa(⌣_⌣”) gửi bn