49. Have already chosen.
50. Have you paid
1. A
2. B
3. C
4. C
5. B
6. B
7. B
8. D
9. A
10. D
--------------------
1. Since -> for
2. Saw -> seen
3. Was -> has been
4. Continued -> have continued
5. Didn't try -> haven't tried
6. Has been -> was
7. Enjoyed -> have enjoyed
8. Played -> has played
9. Knew -> have known
10. Performed -> have performed
11. Had -> were having
12. Was started -> started
13. Has met -> met
14. Didn't see -> hasn't seen
