This book is ............ I am interested in this book

1. This book is ............ I am interested in this book .       (interest)
2. The house is larger but it is in need of ......... .       ( modern)
3. ................, Bob had an accident last week.(luck)
4. We depend on ............. contributions to support our programs.        (volunteer)
​5. I don't believe what he has just said. It is very ............... .            ( reason )