1. The
2.The
3.The
4.The
7.(According to your numbering) A
8.The
9.A
10.A
11.A
12.A
13. No article
14.A
15.The
16.No article
17.The
18. No article
19.a/an (it depends on different pronunciations around the world, I suggest you second check this with your school)
20.The
old english, because of the time period
The answer is:
D) by showing what a typical bicycle looked like at the turn of century.
Hope it helps!
