please help me ill put 77 points on this so please answer them correctly

For questions 6–10, write the label I for incorrect if the sentence is missing one or more apostrophes. If the sentence is correct, write the label C for correct.
6.
Have you ever tried to read documents from early America? (1 point)
7.
Many times the ss look like fs. (1 point)
8.
The numbers can also be hard to read. (1 point)
9.
The 1s, 9s, and 6s all look different than ours today. (1 point)
10.
When the years are written without the first digits, such as 04 or 76, it’s hard to know in what year the document was produced. (1 point)