giúp mình vs ạ :))
17. When you don’t use the electricity, turn off all lights. (Conditional sentence type 0)
--> If__________________________
18. When you leave the room, turn off all lights. (Conditional sentence type 0)
--> If_______________________________________________________________________________
19. The university started building a new campus in May. They are still building it.(The present perfect continuous)
--> The university has_________ _______________________________________________________
20.Nam's still studying English. He started studying it two years ago. (The present perfect continuous)
--> He has_________ _______________________________________________________________
21. Phong Nha- Ke Bang/ recognized/as/ a/ World Heritage Site /UNESCO/ 2003.
22. If/ you/need /help /,/ don’t /hesitate/ ask.
23. Most/ city dwellers /are /happy /their /life /work.
24. We /should/ focus/ either /modern technology /the environment.