Giúp em với please, giải thích giúp em nữa nha, hứa sẽ cho điểm tuyệt đối ạ 
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The teacher sugge
3. 1 suggest recycling things such as bags, cans, and bottles (ABOUT)
- What.....
.... such as bags, cans, and bottles?
You should visit Trang An, a natural wonder of the area. (WORTH)
- It is ...
..Trang An, a natural wonder of the area.
5. They claim that Phong Nha - Ke Bang can be compared to a huge geological museum.
(IS)
that Phong Nha - Ke Bang can be compared to
4.
6.
7.
-1.is.claimed.
a huge geological museum.
This method now works more effectively than it used to be. (DIDN'T)
- This method
... effectively as it does now.
They believe that the best time to visit the complex of Hue Monuments is in April. (IS)
believed.......... that the best time to visit the complex of Hue
-It.is.
Monuments is in April.
8.
I suggest putting these valuable things in high-security places. (ABOUT)
- How ..
3. You should visit the historical places of the area. (WORTH)
- It is....
... the historical places of the area.
10. There is no organisation for social activities for teenagers in this town. (AN)
- I wish...
these valuable things in high-security places?
....... for social activities for teenagers in this town.