=>

33. Some years back young people paid less attention to traditional festivals than they do nowadays./Some years back young people did not pay as much attention to traditional festivals as they do nowadays.

-> some years back (thì QKĐ, S V2/ed)

-> less...than: ít...hơn

-> so sánh bằng as...as

34. They have never experienced the wonderful feeling in space before.

-> this is the first time S have/has V3/ed ~ S have/has never V3/ed before

35. I suggest young children should be taught to take care for the environment.

-> suggest (that) S should V: đề nghị, gợi ý

-> bị động suggest (that) S should be V3/ed

36. It is compulsory for drivers and passengers to fasten the seat belt when travelling in cars.

-> it is adj (for sb) to V

-> it is compulsory for sb to V ~S must V