从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
I don’t think there’s ______ in this book.

A．interesting
B．exciting
C．cheap
D．expensive

A．your computer will always keep safe the important information
B．computer problems are easy to deal with
C．you will have to replace your computer system sooner or later
D．you must change your system regularly