—Look, someone left a book.—Oh, yeah … This book ________be Kitty’s. Only she likes to read this kind of books.

You really need to have a good rest．Remember：nothing ________make up for the loss of your health．

The public transportation is very convenient in that big city , so there______be any difficulty in traveling around .

—There aren’t any toys in our suitcase．Where have you put them?—Oh, no．That old lady sitting next to us ______ have taken ours by mistake.

 It_____ years ago when the incident took place, and I nearly forget it.