III. Find and correct mistakes.
1. hardly => hard
2. although => because
3. that he left => he to leave
4. can => could
5. which => in which
6. too => so
7. who => whom
8. to use => use
9. Although => Despite
10. walk => walking
11. were => would be
12. in => on
13. but => so
14. did I go => I went
15. have waited => will wait
16. this => that
17. hear => hearing
18. wide => widely
19. amn't => aren't
20. Watch => Watching
21. this => it
22. to go => going
