Answer:

1. increased 5 times

2. Some freshmen make up their minds

3. No matter how hard the task is
However hard the task is
No matter how hard the task may be
However hard the task may be

4.nor did he try to

5.With the passage of time

6. It is said that

7. are killed by falling buildings

8. though that is not always the case

9. There is no one who does not praise them

10. There is no doubt that

11. how to avoid getting ill while traveling

12. beyond my reach

13. which is just a waste of money

14. despite his serious illness
in spite of his serious illness

15. surrounded by many boys