change the grammar mistakes about the adjective clause

1. Whenever I get into a situation which it is hard to make a decision, I try to look at it from different perspectives.

2. The student whom I am supposed to return the textbook has left for the library.

3. According to a news story, a man who his dog killed his friend was from Kamloops.

4. The people whom I have met them in my class are very friendly.

5. I just met the student who his computer I am going to buy.

6. Alienation is noticeable among people come from different cultural backgrounds.

7. There are more than one in three marriages will end in divorce.

8. After college, David wants to find a job which he will need to use mathematics.

9. In high school, the students who their cars were illegally parked would get a ticket.

10. The people live in Florida are used to warm, sunny weather for much of the year.

11. The student who plagiarized will fail the paper and possibly the whole course which he wrote the paper.

12. The man whom I met him last night and who immigrated to the United States a year ago speaks English well.

13. I wrote a thank-you note to the people whom I visited their home over the Christmas holidays.

14. The instructor teaches that course is very well organized.

15. I can't understand people who they vote against funding our school system with enough money for teacher salaries.

16. All applications for admission must be submitted by November. Students who their applications are not submitted on time will not be considered for the program.

17. Vancouver, where is located on the west coast of Canada, is a thriving and exciting cosmopolitan city.

18. Mary Ellis who teaches in the ESL Department is the type of person loves detail and data.

19. The IELTS test, that I took two years ago, was very challenging, but I did very well.

20. Douglas College that is located in Vancouver has many international students.