2. People have reported that Thien Duong is the longest cave in Viet Nam. 

-> ......It has been that Thien Duong is the longest cave in Viet Nam.  .................................................................................................................................. 

3. People believe the Perfume Pagoda was built during the reign of Le Thanh Tong in the 15th century. 

-> ................It is believed the Perfume Pagoda was built during the reign of Le Thanh Tong in the 15th century.  ........................................................................................................................ 

4. People say Ha Long Bay is one of the most extraordinary natural wonders you will ever see. 

-> ...It is said that Ha Long Bay is one of the most extraordinary natural wonders you will ever see.  ..................................................................................................................................... 

5. People hope many defensive measures will be taken to protect and preserve our man-made wonders. 

-> It is  hoped many defensive measures will be taken to protect and preserve our man-made wonders.  ........................................................................................................................................ 

6. People believed that the missing boy was wearing a white T-shirt. 

-> ............It was believed that the missing boy was wearing a white T-shirt.  ............................................................................................................................ 

7. People know that Ha Long Bay was recognised as a World Heritage Site by UNESCO in 1994. 

-> ..........It is known that Ha Long Bay was recognised as a World Heritage Site by UNESCO in 1994.  .............................................................................................................................. 

8. People believe that the best time to visit the complex of Hue Monuments is in April. 

-> ...It is believed that the best time to visit the complex of Hue Monuments is in April.  ..................................................................................................................................... 

Đáp án: It is reported that Thien Duong is the longest cave in Viet Nam.

Đáp án:

It is reported that Thien Duong is the longest cave in Viet Nam.

Đáp án: It is reported that Thien Duong is the longest cave in Viet Nam.

It is reported that Thien Duong is the longest cave in Viet Nam.

It is reported that Thien Duong is the longest cave in Viet Nam.

1. It has reported that Thien Duong is the longest cave of Vietnam.

2. Oranges aren't as cheap as apples.

3. You work hard or you won't pass the exam.

4. Ba wishes he could speak English well.

5. Rice is grown in the tropical countries.

1. People have reported that Thien Duong is the longest cave of Viet Nam.

=> Thien Duong has been reported to have been the longest cave of Viet Nam.

2.Apple are cheaper than orange

=> Orange is more expensive than apple.

3.Unless you work hard,you won't pass the exam.

=> If you don't work hard, you won't pass the exam.

4.Ba can't speak English well.

=> Ba speaks English badly.

5.They grow rice in tropical countries.

=> Rice is grown in tropical countries.

1. People have reported that Thien Duong is the longest cave of Viet Nam.

=> Thien Duong has been reported to have been the longest cave of Viet Nam.

2.Apple are cheaper than orange

=> Orange is more expensive than apple.

3.Unless you work hard,you won't pass the exam.

=> If you don't work hard, you won't pass the exam.

4.Ba can't speak English well.

=> Ba speaks English badly.

5.They grow rice in tropical countries.

=> Rice is grown in tropical countries.

1. It is expected that more than 100,000 people will attend the festivals at the Perfume Pagoda this year.

2. It has been reported that Thien Duong is the longest cave in Viet Nam.

3. It believed that the Perfume Pagoda was built during the reign of Le Thanh Tong in the 15th century.

4. It is said that Ha Long Bay is one of the most extraordinary natural wonders you will ever see.

5. it is hoped that many defensive measures will be taken to protect and preserve our man-made wonders.