Each sentence has a mistake. Find the mistakes and correct them. 11. If I have free time , I go fishing with my father 12. The explorer which discovered America is Christopher Columbus. 13. I wish I could go to see all the wonders which has been recognized by UNESCO. 14. Mai said that she will go to Hanoi the next day. 15. If we use fewer fast food, we can avoid putting on weight. 16. Na often finish her homework before she goes to bed. 17. My father is the man whom teaches me how to laugh , cry and love. 18. Energy-saving bulbs should be used to saving electricity. 19. My family has gone to Da Lat three years ago. 20. I’m very proud in my father