Giúp mình với!

Here are the corrections for each sentence: 1. My mother doesn't cook the meal. 2. The cat doesn't kill the rat, but the rat killed the cat (minor change for tense consistency). 3. People are not used to speaking English in Vietnam (this sentence is already correct). 4. Tom didn't paint the house yesterday (this sentence is already correct). 5. We didn't see the accident (this sentence is already correct). 6. The writer didn't write this novel (this sentence is already correct). 7. Nothing prevented Phuong Anh from eating noodles (this sentence is already correct). 8. Camtien found the exercises difficult (this sentence is already correct, assuming 'Camtien' is a name). 9. They must write to Lan (this sentence is already correct). 10. He will look for me at the station at 3 a.m. (minor change for correct preposition). 11. People have been waiting for him for 10 days (this sentence is already correct). 12. Spams flooded the forum (minor change for more idiomatic verb choice). 13. Everyone in group I crowded the narrow classroom (minor change for noun form consistency). 14. We can't make tea with salty water (minor change for correct noun). 15. Tom has taken away some of my books (minor change for correct verb form).