Heya here’s your answer
1) He told me that he could help me
2) They said they would join us for lunch
3) I told you that I was going to be late
4) The article said that the accident happened the day before
5) Our teacher had told us that she had lost our homework
The second one is the best answer
B it relates with it and it’s the best answer
the answer is c I hope this help you
1-the
2-the
3-an
4-a
5-the
6-some
7-the
8------
9-nothing need to be changed
10-any, some