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3. Ha Long Bay is recognized ________ UNESCO as the world Heritage site.
A. for B. by C. in D. of
1. HL Bay was ....recognised.... by UNESCO as a World Heritage Site (recognition)
2. There are three trains ....daily... from Ha Noi to Lao Cai (day)
3. It is a contest in which ....participant..... have to read two poems in English (participate)
4. Tim and Shannon want to visit an ....oceanograghy.... institute in VN (ocean)
5. The problem is difficult, I can't ....solve..... it (solution)
~ Study well ~ 
1. Ha Long Bay has been recognized bu UNESCO as a Word heritage site (Câu bị động)
2. The robbers have been caught (Câu bị động)
3. Mary used to slee in the same room as her parents when she was a child (Câu có cấu trúc used to; used to có nghĩa là trước đây thường xuyên làm việc gì nên câu trên ta không thêm usually)
1 surrounding
2 closing
3 attraction
4 inhabitants
5 originally
21. recognised
22.sunny
23. guest house
24. beautiful
25. seeing
26. on
21. recognised.
22.sunny.
23. guest house.
24. beautiful.
25. seeing.
26. on.
Ha Long Bay was ………recognised………..by UNESCO as a World Heritage Site. (RECOGNITION)