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.

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

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.  ..................................................................................................................................... 

 It has been reported that Thien Duong is the longest cave in Vietnam.

Đáp án: Young people didn’t used to play computer games in the past.

Young people didn’t used to play computer games in the past.

Didn’t young people used to play computer games in the past?

Đáp án: Young people didn’t used to play computer games in the past.