7. will get

-> The weather won't get better next week. 

-> Will the weather get better next week? 

8. have

-> The teachers don't have a monthly meeting on every Thursday.

-> Do the teachers have a monthly meeting on every Thursday? 

9. was practising

-> Thu wasn't practising her music lesson at 8 o'clock last night. 

-> Was Thu practising her music lesson at 8 o'clock last night? 

10. need

-> The local authorities don't need help from their peopel to keep the parks and the beach clean. 

-> Do the local authorities need help from their peopel to keep the parks and the beach clean? 

11. will use

-> People won't use solar energy instead of electricity some day. 

-> Will people use solar energy instead of electricity some day? 

12. received

-> She didn't receive a letter from her friend yesterday. 

-> Did she receive a letter from her friend yesterday? 

13. will have worked

-> The students won't have worked on a project by this time. 

-> Will the studnets have worked on a project by this time? 
14. has taught

-> She hasn't taught us since 1999. 

-> Has she taught us since 1999? 

15. protect 

-> People don't protect the environment by getting rid of using harmful stuff.

-> Do peopel protect the environment by getting rid of using harmful stuff? 

16, are killed

-> Elephants aren't killed for ivory. 

-> Are elephants killed for ivory? 

Bn học tốt!!

(sai thì thông cảm cho mình nhăn ;-;)