A:Mum,I’ve lost my art book.Have you　　it anywhere?
B:Is it the book　　a red cover?
A:Yes,that’s　 ! Where did you　　it?
B:Sorry,I  　　seen it    .   you tried to look    it under your bed? Maybe you dropped(丢) it there.
A:Oh!Here it    .    goodness!
B:You should    more careful from now on.
A:Yes,it won’t happen(发生)    .