Ineed use modal verbs (could have, should have, might to complete this
1. (buy) bread but i didn't know we needed it.
2. (not invite) so many people to our party! i'm worried that we won't have enough room for everyone.
3. (start) saving money years ago!
4. the (had) to make an emergency landing.
5. the story appeared on the evening news. (been) a rather memorable day for the pilot.
very much

1) I could have bought bread but I didn't know we needed it.

2) We shouldn't have invited so many people to our party! I'm worried that we won't have enough room for everyone.

3) He should have started saving money years ago!

4) The plane might have to make an emergency landing.

5) The story appeared on the evening news. It could have been a rather memorable day for the pilot.

c. a group of tribes that formed a confederacy

1# the answer is c

2#the answer is a