5. It seems that she doesn't have a computer in her bedroom.
Apparently/Presumably . . .
7. That is, without a question, a great idea.
definitely
4. Everyone can see that's a mistake.
Undoubtedly/Obviously/Clearly . . .
8. This is a pity. But not everyone lives in a nice house.
Sadly/Unfortunately. . .
1. To tell you the truth, I don't like her bedroom.
1 To be honest/Honestly/(Quite) Frankly . . .
3. To give you my opinion, I would tidy the room up straight away.
Personally . . .
2. They say that she's got two brothers.
Apparently . . .
6. He agreed to help, but that was a silly thing to do.
foolishly/ He foolishly agreed to help. (change in word order)