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22.  I suggest recycling things such as bags, cans, and bottles               (about)
    -  What……………………………………………………………………..
   23. You should visit Trang An, a natural wonder of the area. (worth)
    - It is  . . . . . . . . . . . . . . . . . . . . . . . . . . . ……………………………………………………….
    24.They claim that Phong Nha – Ke Bang can be compared to a huge geological museum. (is) 
  - It……………………………………………………………………………………………………..
  25. Tom drives his car more carefully than Peter. (less)    - Peter………………………………………
  26. It was confident of him to say that he was the best student in his school. 
  He was …………………………