1) They plant many flowers in Sapa.
=) Many flowers are planted in Sapa.
2) Ha Long Bay was recognized as a World Heritage Site by UNESCO in 1994.
=) UNESCO recognize Ha Long Bay as a World Heritage Site in 1994.
3) American Schools are different from Vietnamese Schools.
=) American Schools aren't like Vietnamese Schools.
P/s: Mình học Anh văn cx ko giỏi lắm đâu, có thể còn có sai sót, mong bn thông cảm nhưng hy vọng giúp đc bn. Chúc bn học tốt nhé