=>
35. Since/Because there was a traffic jam, we came home very late last night. (because S V = because of N/Ving)
36. The last time we visted Da Nang was over 5 months ago. (the last time QKĐ)
37. If we aren't careful, we can't avoid minor mistakes. ( đk loại 1 If S Vs/es, S can/will V)
38. The Ao Dai has been modernized by many fashion designers for centuries. (bị động HTHT have/has been V3/ed)
39. Because of the clear instructions, the students followed them easily.
40. The correct answer couldn't be given to this question. (couldn't be V3/ed)