1. Air pollution is the worst problem in big cities.
2. The fire destroyed their building completely last night.
3. We received a complaint from that customer yesterday.
4. I bought these things at a convenient store near my house.
5. Fog and rain are common in the mountainous regions near the border.
6. To avoid using single-use products like plastic bags is a way to protect the environment.
7. You should make a list of all things you want to buy when you go shopping.
8. They didn't receive any warning about the storm to move to a safer.

1. pollution
2. destroyed
3. complaint
4. convenient
5. mountainous
6. protect
7. shopping
8. warning

. Air POLLUTION is a big problem in many cites in the world . ( pollute )

2. We should stop the enviroment POLLUTION ( pollute)

3. We should use SAVING energy bulbs. ( save)

4. The ENVIROMENTALISTS are interested in protecting our enviroment . ( enviroment )

5. We brush our teeth 2 TIMES daily ( twice )

6. Their FRIENDSHIP lasts for 50 years . ( friend )

7.His FLIGHT is late because of the bad weather . ( fly )

8. He is very HELPFUL . He often helps me wih difficult exercise ( help )

9.He is doing a very TIRING work ( tired )

10. Nam is always BUSY ( business )

11. Tourists like the FRIENDLINESS of peope here ( friend )

12. Students need their SIGNATURE on their exam papers ( sign )

13. Lan's mother is a CAREFUL ( care )

14.I'm sorry. I CAN'T SPELL your name ( spell )

15. she has some DIFFICULTIES speaking English ( difficult )

16. The new PRODUCT of that company is very good ( produce )

17. What is your SUGGESTION about our weekend ( suggest )

18. Can you give me some SUGGESTION ( suggest )

19. We should try to reduce POLLUTION (pollute )

20. POLLUTION is a big problem in many big cities ( pollute )

21. The Earth climate is becoming WARMER ( warm )

22. The storm is very DESTROYABLE ( destoy )